the car has a slight tap comin from the mid driver side of the car. the car has recently lost bottom end power and started running richer than usual, also it now backfires after letting off the throttle.... im goin to buy new distributor cap and rotor, new fuel press reg and see if that clears it up a lil... i just did a lt/x pipe install and i was thinkin the 02 sensor may be messed up or not in tight enough.. possibly the headers werent tight enough and i have a leak in the gasket?? any suggestions?