HAve the exhaust backpressure checked, pull an oxygen sensor, or disconnect the exhaust before the cat and drive. If it is better, you have an exhaust restriction. If you are getting black smoke out the tailpipe and the exhaust system is not plugged, a possible map sensor, or vacuum supply to such. I think the map sensor is on the ecm, but not 100% sure.
Monday, July 27th, 2009 AT 10:18 PM