ok my car has a missfire in cylinder 3 at idle and under load i changed the plugs the wires the cap and the rotor i tested the cylinder and it is getting spark i did a compression test and topped out my 300 psi gauge in all 4 cylinders with the engine cold i pulled all the plugs and the 3 that were running rite looked fine and the one that has the missfire was dark black for some reason iam stumped what could cause all the cylinders to work except cylinder 3 please help ??

 

bad injector?

 

there rc 310 injectors ... in the car now i have no idea how to test if the injector is bad

 

bump

 

you know if they are clogged at all? gunk on the tip of the injector>? i had the same problem, checked injectors, they were clogged. Installed new ones and it went away.

Prob not the problem but you never know.