I am ready to drive this car off a cliff.
We have an 01 2.5RS, the engine started to have a bad misfire. I replaced plugs and wires, no improvement. Took it to a dealer, they found a cracked y-pipe, also showed codes for misfires on 2,3,4 cyls, cat sysytem efficiency below threshold (p0420), evap emission control system malfunction (p0440),
and evap system vent control low imput. We replaced the y-pipe and cats, now runs even worse. If revs go below 4000, the engine just about dies. While we were waiting for cats to come in, the shop put a straight pipe in, and the car ran fine. They installed the cats today and its bad again. Does anyone have any ideas why this would happen?