Engine Performance problem
1997 GMC C1500 V8 Front Wheel Drive Automatic 170K miles
The garage mechanic told me the code said that both catalytic converters are bad. This seemed to have happeend after the tune up was done. I can reset the code and the light comes back on after the car warms up going down the road. If I go over 65 mph, sustained, the check engine light will flash until the slow back uder 65. There seems to be a slight jerking action running at a constant speed, almost like transmission but no other transmission symptoms exist. Do I try replacing the 2 post O2 sensors or what do you suggest?
have the same problem?
Friday, March 14th, 2008 AT 8:21 AM