First off I've searched this forum for the past 2 days to try and find a solution and I still can't figure this out.
My roommate has a 97 GTP with 215k, the only mods being an HAI and ported blower. A few days ago on his way home from work his SES came on and he said the car started sputtering and surging. He took it to get scanned and was told it was a multiple cylinder misfire. So we replaced his plugs and wires and everything seem fined at idle, but the moment the car started to receive boost the misfire came back. We checked all the vacuum lines and found out the line for the bypass valve broke, fixed that yet the problem persists. I swapped all 3 of his coil packs for the ones in my 03 Monte Carlo SS (l36) and still nothing. After all this we decided to unplug his battery and on his way home from work today hes going to have it re scanned to see if there's anything new.
All the other threads I've found about the subject have either fixed it with what ive already tried or have died.
We've tried swapping out his MAF for a new one straight out of the box, and it's still being silly. The only bit of information I found on here thats helping is someone said that running the car with "no exhaust" could cause a burnt valve. Awhile back we had to replace his driver side engine mount and in the process broke one of the bolts on the crossover pipe causing a pretty bad leak. The car has a "rebuilt" engine and tranny so I'm assuming the LIM gasket has been replaced.
That's all the information I can remember at the moment, I'm sure later today I'll be able to give some more. If theres any more info that might help just let me know.
