Ok I changed the wires, plugs, coil, gm opti, everything except the ignition module, checked my fuel pressure (42lbs) Everytime my car approaches 5250 rpm it just starts misfiring like crazy, I used an auto zone coil, could it be weak, should I purchase the msd blaster coil. Jason Cromer sent me an new opti to swap out the one I just put in a week ago, but I want to make sure thats it before I go through the install again. It seems to progressively be working down in rpm. Used to only do it as it approached the programmed shift point of 6200, now it is doing it right above 5000 rpm. Ed wright has checked the shift points as I thought that I was hitting the rev limiter originally but he says that it is ok. I am baffled as to what to do next, should I put the new opti on or what, PLEASE HELP, thanks PS Mods in sig

 

please help guys, i need to figure this out so I can fix it while I am on leave, thanks

 

ttt

 

from what ive read.........a lot of people have problems with aftermarket coils (the msd has stranded a lot of people).......and have better luck with the factory coil.........i think ac delco........not sure if it will fix your prob, but worth a try.