Quote:
Originally Posted by markgutZ
... previous owner put a hole on the mid pipes to make the sound louder.. would that be it? ...
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That's more than likely the problem - plug the hole(s) and see what happens. You could have a bad O2 sensor, especially if you have a lot of miles on the car, but the hole needs to be plugged for proper operation.
Monitoring the O2 sensors with an OBD/CAN tool will help you troubleshoot. The FSM (link in my sig) is a valuable (and free) resource for all DIYers.