I've been trying to figure out why my 1994 z28 is missing at idle.it isnt a strong miss but I want to fix it. I checked the spark plugs for proper gap, the wires, cacuum leaks. I just adjusted the valves to zero also and it still misses. I pulled the egr off and cleaned it but i did notice if i shake the egr valve it rattles. there isnt an engine light on. Other then idle the car seems to drive good.

 

Have the injectors ever been cleaned?

 

not that I know of. the closest thing to cleaning the fuel system was treatment.

 

Plugs can crack, wires can burn through. When were the plugs and wires changed? How old are the O2 sensors?

Sounds like its getting worse:

https://www.camaroz28.com/forums/sho...d.php?t=828850

 

I checked the plugs and they looked good. like if i just put them in a few hundred miles ago. I just had to chang the gap on them. the wires seemed ok too, they were just different brands. I had some put a scanned on it and he seen #4 & #7 seemed a little off and said to check the injectors. I did that and there all around 12.6 - 12.8 ohms. yeah it seems to be worse. havent changed the o2 sensors and dont know if the guy before me did.

 

I just done a comp test and cylinders 3-4-5-6-8 are at 205 and 1-2-7 are 200 psi.

 

i have the same exact problem with my car. ive tired changing my fuel filter plugs and plug wires lucas fuel injector cleaner and sea foam. nothings helping my cars even the same year as yours. so if you ever figure out what the problem is please let me know.