p0300

  1. S

    P0300 cylinder 2 and 4 missfire

    Hey all, i have a 1999 GMC suburban k1500 with the 5.7 vortec. It has a p0300 missfire. Live data says its cylinder 2 and 4 are the culprits. New parts replaced within last 20k miles or so: Auto line full metal distrubitor (Replaced because the plastic ears broke off the old one causing the...
  2. J

    Rough idle, p0300, p1351 on gmc 1500 97 sierra sl 4.3 v6.

    This truck has been sitting in our pasture for a couple years now, and we finally are trying to get it up and running. It first didn’t start, so I replaced the battery, it runs now but has a very rough idle, if I give it gas it smooths out quite a lot but when we start to back it up or idles it...
  3. J

    P0300 and P0302 With new long block 1996 K3500 5.7l

    I have been having a lot of problems with my 1996 K3500 5.7l The truck has about 220K miles on it. I recently had problems with it running very rough. I found out I had low compression on two cylinders, So I decided to get a new Long Block. I replaced a lot of other parts with it. -Blackbear...
  4. 96CK

    So. Many. Codes. **Solved**

    Alright, here we go..... **Edit #2 - Solved** So, I got to reading and read a post that reminded me of something. Keep it simple stupid....... I went back under the hood with a spot flashlight and started looking around. I immediately found a vacuum line (one of the small, like 1/4" hard...
  5. George Schreffler

    Request help: L31 5.7 Cylinder 5 Misfire

    Looking for help with ideas to diagnose and fix my 1998 Chevy K1500 5.7L L31 misfire. The situation and actions I have taken to date appeaser below. Any thoughts on where to go next would be appreciated. Symptom - Cylinder 5 misfire at all engine speeds - P0300 DTC; no other DTCs. Diagnosed...
  6. S

    P0300 1996 K1500

    I just bought a truck with a random cylinder misfire. Little back story on the truck, it was this guys brothers who passed away, he parked the truck and it sat for over a year. I went to look at it wouldn't start, i noticed a spark noise which i then saw coming off the distributer was chewed...

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