Engine Performance problem
1991 Chevy Cavalier 4 cyl Two Wheel Drive Manual 66000 miles
After replacing the catalytic converter, the car was intermittently running rough, shaking, low idle, sometimes surging, jerking while driving like the engine is going to stall. When it runs rough, I sometimes smell raw gas, and the exhaust fumes smell real bad (not the rotten egg smell). It will run rough when cold or hot (temperature doesn't seem to matter). When it runs rough, there is a loss of power. The ignition coil for two cylinders, one vacuum hose, and the EGR valve were replaced. We checked the plugs, coolant, oil, air filter, and all other fluids. All checked out okay. The shop told me they couldn't find the problem unless the car ran bad all the time. We are wondering if the catalytic converter could be partially plugged, or have something in it that might move around and sometimes cause it to be plugged and run rough. We also were wondering if it could be the O2 sensor, fuel filter, fuel pump, or other vacuum hoses. Any helpful suggestions are appreciated.
Sunday, March 8th, 2009 AT 11:32 AM