I have read many threads on this wonderful site and spent many hours doing so. However I am still having a misfire/stuttering problem in my Vector. I have cleaned MAF, replaced all plugs with OEM and replaced all coil packs with OEM at great expense. I have a code reader that shows P0300 (random multiple misfire) and P0301 (cylinder 1 misfire). Like I said, I've replaced all plugs and coils and spent many $$. My code reader shows a little red X next to the O2 sign as well as next to Evap and sometimes next to AIR. However, no codes get thrown when the stutter/ misfire happens. I would assume my next course of action would be to replace the O2 sensors but that seems like a lot more $$$. The Saab mechanic thinks it could be Turbo Control Valve or blow off valve. He says it seems like it's cutting out to avoid overboost. I'm stumped and broke.
Any advice on where to go from here would be appreciated.
Any advice on where to go from here would be appreciated.