Thread: p0300

I just recently top swapped my grand prix gt and all was good for a day. i had a rocker pop off so i had a cylinder 6 misfire. Fixed that now i have a random one. i no its cylinders 2 and 3 cause i had a friend at gm use a scanner that showed which cylinders were missing. I have brand new autolight 104s gapped .55. New wires, coils and i have tried different icms. I have also tried moving fuel injectors around but it doesnt seem to be working because when i pull the injectors of the cylinders the idle doesn't change. But when i swapped them then pulled the suspected injectors off the idle dropped and got ruff so i wouldn't think they are bad. Compression check was good. Fuel pressure was good. Anyone else had this problem and found out why. Could it be my ZZP pcm tune.

Headers, 1.9s rockers, 180 therm. I tried swapping plugs. I tested the wires with a noid light and they were getting power.

Anyone?

Well I figured it out. I put the old plugs in and it runs better but sputters if giving to much gas. I had autolite 104 gapped at 56. My old plugs that are in now are gapped 50. I was just wondering am I running to rich and fouling plugs or did I just have them gapped to much.