Engine Performance problem
1993 Buick Park Avenue 6 cyl Front Wheel Drive Automatic 230000 miles
I have a surge, only at idle. The car runs great down the road. Takes off well etc. It was throwing an EGR code before this issue so I changed the EGR (pintle was stuck open) and cleaned the throttle body and mass air flow sensor. Now it seems to lobe at idle but not a misfire. I checked voltage for the TPS, removed, tested and cleaned the IAC, and checked fuel pressure (44psi) and even checked the pressure regulator (pinching return line). There seem to be no vacuum leaks that I can hear or react when sprayed down with carb clean. Any ideas?
have the same problem?
Tuesday, April 6th, 2010 AT 8:09 AM