backfire

  1. O

    hesitation and pops when full throttle

    I own a 1998 C1500 with a 305 and a 4L60E. The truck has short tube headers and a full exhaust. I’ve noticed that during normal driving, it runs fine with no pops or hesitation. However, when I go past 70-80% throttle, the truck pops, hesitates, and usually falls on its face. Sometimes, though...
  2. 9

    '97 454 hesitation after start

    Just gave the forever truck its first job this weekend - pulled a car trailer about 160 miles. Significant difference in feel from the '05 6.0 - it's way less stressed. BUT, it's coming down with a behavior that I don't understand. It started out as a heavy hesitation after each shift, just...
  3. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    Hello, newby and looking for advice. Thanks in advance. 1993 GMC K3500, 7.4, TBI, 156k miles, 4L80E Auto Trans (Jasper Reman tranny installed 2 years ago) I have owned it 6 years and it goes to the dump and plows snow in and out of our property in the winter. Always had a high idle (1000-1200)...
  4. HaremStorm

    Semi-urgent engine problems pt2

    Hey all, new day. New issues. Truck desc. is in the signature. (Duckie) it's sounding like I'm missing 4/6 cyl. on top of my old issues (see attached links for video and previous post) it's really the full package. Spits sputters backfires through exhaust extremely rich to the point fuel is all...
  5. L

    Please help! ‘90 k1500 tbi Chevy performance mild build crate motor

    We’ve been at this since October so I’ll try my best to put every part number here So I have a 1990 Chevy k1500 with the tbi setup stock. Then added these Chevrolet Performance 350 Vortec C.I.D. 330 HP Crate Engines 19433030 Summit PN NAL-19433030 Long tube headers SPN HED-69440...
  6. C

    Engine Backfiring While in time

    Recently dropped in a crate motor from Jeggs into a 2000 Chevy C3500 SWB with the 5.7l 350 Vortec. Everything was running pretty good before all this mess. After 2k it was time to readjust the valves after they fully seated (roller cam with rocker arms and pushrods). Stripped it down past the...
  7. TwistedTahoe

    Backfiring, Bucking and stumbling

    I've got a 1995 Chevrolet Tahoe 5.7L 4wd 4l60e and it backfires at any rpm. I started with the basics; fueling, timing spark, and found everything was in spec. I'll put together a list of new parts and their brands if I can recall them(Don't get mad at me for throwing parts at it, I had these...
  8. H

    Rough idle back fire then dies

    Hello I am new to this site. I alway work on my own vehicle but i am not a mechanic but enjoy fixing my own truck. So i swapped transmission on my 1995 gmc Z71 when taking it for a test drive the throttle got stuck at wot! I had to put it in neutral shut the engine off and pulled off the cruise...

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