Hi all, I am new here and just bought my first third gen the other day. I have attached pictures of my 1986 Iroc with a 5.0 Stock. I don't know if the attached pictures are causing the problems but I can't find what they are in the manual or the haynes repair book. Should they be connected? What are they? Any help greatly appreciated. Thanks.



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It’s esc for knock retard control. Yes connect them.

 

As for the misfire you should start with tuneup items. Plugs, wires , cap /rotor. You can get plug wire pliers that are insulated to pull off one wire at a time to try to borrow down the effected cylinder.

 

Great thanks. The check engine light is on so I am going to scan to see what code pops. I was thinking it might be the ignition control module.

 

IIRCC, if the esc is disconnected it throws the light