I just picked up a 2000 Jimmy it has a miss on idle but smooths out under acceleration. I changed the cap rotor plugs and wires all ac delco parts. I found a couple bad wires from the set I took off. I still have the misfire at idle and today the #4 cyl misfire code came back. I'm thinking bad injector or spider seeing its the same cylinder everytime and only misfires at idle. This sound about right?

 

I would pull the plug and and check the gap and condition first. Maybe even replace plug. Doubtfull but a while back I was chasing the same issue and the plug was loose

 

I already checked that. It was good to go.

 

What doesnt make sense is its only at idle

 

I'm going to do a leak down test on it tomorrow

 

good luck could also be a sticking injector

 

I did the leak down test it stayed above 55 for over 10 mins. I've checked and rechecked my plugs wires cap and rotor I'm confident its not that. Ill check the injector pulse with a noid light when I get home. I just about positive I have a injector spider issue.

 

how come you went from justin 56 to justin 16?

 

I need to delete the Justin16 one I was gone for a while and had to create a new profile and just by luck I logged in with the right pw to my old one

 

I did all the same things and still have the misfire #4 code haunting me. Was it the injector?