This is a crosspost from exhaust after seeing this is probably not an exhaust problem.. Could i have broken something getting the passenger side header down there? I dont think i did anyway...


Just installed Edlecbrock TES Headers and Y-Pipe... 3inch catback already on car. I don't think its the headers fault, but, the car runs VERY VERY rough... Idles very very rough and backfires like popcorn even at idle. Sounds like it is coming out of the driver's side header but i could be wrong. Any ideas? also installed new spark plugs Bosch Platinum (same as was in before the install) and I also have accel 8.8 wires and accel cap and rotor (also previously installed) After checking the firing order i yielded no results.. if anyone has a diagram of that or any other great Ideas I would appreciate it... 88 IROC 350 TPI. Had headers on it before but they were leaking badly.... Please send any ideas... Car is rendered useless for now =(

AceIROCZ

 

Trace your ignition wires from the cap to their respective cylinders AGAIN, and AGAIN, and AGAIN! You wont believe how many times I have done this & have mistaken them over & over!

If your wires finally do check out being ok, check your plugs. If you removed them while installing your headers & 1 of them fell or something, it could have cracked or closed the gap.

But i would check the wires because i would be willing to bet you have 2 of them crossed....

BTW. 1-8-4-3-6-5-7-2

 

ditto..........damn plug wires have given me some hard times in my day LOLOL

 

8 7
6 5
4 3
2 1

[Front of Car]

I can't imagine that you would have moved the distributor while you were changing headers, but, I checking the timing probably wouldn't hurt anything either.