So a friend of mine has a 1.8t 03 a4. It originally threw a code P0171 which was a vacum leak,i found out that the crankcase check valve was cracked and i replaced that. After i started the car it ran fine for a few seconds then started misfiring like all hell. I then scanned it with an OBD scanner and it came up with different cylinders misfiring pretty much all. Do you guys think all 4 coil packs went from when the car was misifiring with the busted check valve?
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