ok well i had my car at 14 pounds of boost on a built motor, i wnated to turn up the boost. so the night before goin on the dyno for tunning i installed msd, and the car was runnign good even after msd. well we change the wastegate spring and got it on the dyno. we get a few pulls and **** hit the fan. it started tosound like it was mis fireing, well we changed the plugs no change. then we quit for the night for me to go over wireing and the vafc that was already in there.

went though all wireing and drove it to get new wires incase that was the problem. got them no changed then it startedbreaking up bad then it took a ****. well i changed the ignitor and tried to start it up and it started right up but like **** still. this was an ls (if thats different, i didnt think the ignitors were different) well i decided to see if it will do it if i put the orginal 14 psi sprign and chipp that it was already tuned on. well it ran even worse adn with in an hour the car **** again. now thinking it was the msd i ran it back to stock and still no changed? im completely lost the symptoms of the car is bouncing idle, breaking up, my a/f is all over the place. I AM LOST< maybe followed out spark plugs, map sensor (which is a 2.5bar) ecu, i am lost

someone help sorry for the long read but im completely lost

 

It almost sounds like your head gasket took a dump between two cylinders. Do a leak down test.

 

i could see where that might change my a/f, but would it get a shitty idle and bad respsonse. i do have a huge overheating problem the first day my car died the car overheated really bad my needle was cold then jumped way into teh red zone almost liek the needle was stuck and it shut off, and i later find my fan broken. but no leak around the head or anything

 

great dont all help at once

 

Does it go putt putt putt at idle?

Did you do a leak down test yet?

Are you running open downpipe by chance?

 

no open dp, and i did a compersion check and its good