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  1. 9

    Lifted Yukon 5.3 Swap Exhaust?

    Hey, Ive gone through most of the threads and havent really seen anything on this, sorry if it's already out there I spend hours on different forums looking. So I have a 1997 yukon 4x4 originally 5.7L. It has a 4" rough country lift and Im swapping a 5.3L LM7 into it. I had to modify the stock...
  2. 9

    K3500 long tube headers with RC 6" lift?

    Im also wondering this but with a 4" rough country lift on a yukon
  3. 9

    5.3L LM7 Swap into OBS

    I'm currently trying to figure out which cam to put into it. It will be a dd city and highway, I'm wanting it to have a good amount of power at lower rpm's. (Good power and good driveability). Im thinking of going with the SPDC SD0053 (205/210) and upgrading the springs with it of course. But...
  4. 9

    5.3L LM7 Swap into OBS

    I was wondering about the fuel system. My in-tank pump is brand new as it had stopped working a week before my engine went. Am I able to leave that pump in the tank and just do an inline high-pressure pump with that of course running new fittings and lines
  5. 9

    5.3L LM7 Swap into OBS

    Hey, I'm going to be swapping the 5.7 in my '97 Yukon (4L60E and 4x4) with a 2002 5.3L LS over the winter. I know there's a lot of mixed info out there, and I was wondering what others' experiences were, things they wish they had done instead, and overall just recommendations and quality parts I...
  6. 9

    Rough Country 4"/6" kit install tips.

    Hey! Ive had a 4” rough country lift in my 1997 yukon for around 4 months now. Slowly more and more clunks are showing up whilst driving. When i was haveing a look over... i noticed the crush sleeve inside the frame for the front upper control arm mounting brackets are sticking out(see photo)...
  7. 9

    Runs Rough Under Load

    Just wanted to post this just incase someone looks at this thread later on.... I removed my throttle body today for normal cleaning, and when i peeked inside the upper intake manifold I saw a clean moist spot. aka my spiders are leaking. I will be replacing them soon and converting to mpfi.
  8. 9

    Runs Rough Under Load

    I had put the fuel pressure somewhere in this thread and it was within spec, the fuel filter is new. I do believe this issue could be driveline related it only really happens when the tranny doesn't shift propperly
  9. 9

    Runs Rough Under Load

    The scanner wasnt reading a code for the rich, it was just in live data (specs from the vehicle whilst it was running). Yes, it still runs rough, once it starts its the worst at high rpm... i have to let off the throttle for a while for it to go away. And i cant take the scanner from the shop...
  10. 9

    Runs Rough Under Load

    I don't believe they are ACDelco they were just ones from my shop. I know ACDelco are good replacement parts for these older gm's. I believe the old wires were ac Delco, however, it had the issue before all the brand new parts.
  11. 9

    Runs Rough Under Load

    I fixed it today, bottomed it out fully counterclockwise and got it exactly to zero when revved up there was no change. it seems to idle better, shift better, and accelerate better... however it still doesn't like hills and continues to have the same problem
  12. 9

    Runs Rough Under Load

    my bad lol I mixed up the hold-down bolt for the actual distributor with the cap.
  13. 9

    Runs Rough Under Load

    i It may have been incorrect because I was idling at around 750 when I checked it. i don't understand how loosening that little screw can help change the cam retard... the distributor cap can only bolt down one way so how is it possible to change the degrees. wouldn't it just causes a bad...
  14. 9

    Runs Rough Under Load

    The scan tool simply stated bank one and bank 2 rich. Im not sure if it has a record function but its a $4000 dollar scan tool so it doesn't leave the shop for personal use sadly. ill have to buy a little scan tool and have someone look at it while i drive. The problem is it only throws a check...
  15. 9

    Runs Rough Under Load

    I had time to use my shops Autel scan tool on lunch today... there werent any stored codes, nor was there any freezeframe data. I allowed the truck to warm up and took a look at the live data. There wasn't a single misfire, Bank 1 and 2 was running rich, and it appears as tho all the sensors are...
  16. 9

    Runs Rough Under Load

    the cat's were supposedly replaced before i bought the truck could it be possible that they are bad and that is whats causing it?
  17. 9

    Runs Rough Under Load

    thats interesting Ill try and check that
  18. 9

    Runs Rough Under Load

    Ill give it a try
  19. 9

    Runs Rough Under Load

    Service engine soon
  20. 9

    Runs Rough Under Load

    I know right. The one day it was so bad the light was flashing, by the time I got to scanning it (without turning off the truck) no codes were there.
  21. 9

    Runs Rough Under Load

    T 1. The fuel pressure at idle is 52 at idle and 60 when revved up. and the fuel filter is brand new it did not affect the issue 2/3.It was a new distributor cap, rotor, plugs, and wires as of October 2020. 4.I have already connected my shops Autel scan tool and it doesn't have any stored...
  22. 9

    Runs Rough Under Load

    Hello, I own a 1997 GMC Yukon 5.7L v8 4x4 with the 4L60e trans. I've been stumped over an issue for a while now and I'm trying to find a real place to start. If I'm going up a hill and continue at or exceed 1500rpm going 70-90kmph the truck will run extremely rough, (feels like a terrible...
  23. 9

    Speed Wobble

    I have a 97 yukon with not even 100k on the 4" rough country lift and the front end seems to be doing this. The vibration/wobble seems to happen between 0 and 50 kph. its got me and my co-worker stumpped

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