Quote:
Originally Posted by 91DropTop
ok so i have a 2000 trans am ws6 ls1 6 speed, i already had a borla cat back on the car, and i just finished installing SLP long tube headers, high flow cats and Y Pipe. the car seems to idle and run smooth. so i took it for a ride to test out the new sound. under normal driving sounds fine and drives fine, so i tried to get on it a little and it back fires and falls on its face and if you keep it going it seems like a miss. i hooked up to my scanner and there is no codes logged.
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It sounds like it was running fine before the header install, and the problem started afterward.
If this is the case, you probably have a damaged spark plug and/or plug wire. It's fairly common when doing header swaps if you don't replace the plugs after the headers are bolted up, or the plug wires aren't fully seated.