Hello all!
I have a 1993 Grand Prix 3.1 V6, with 185k. Recently I started having the issue when I let off the gas while at a good speed (60mph you really feel it) it jerks, then drives on fine. Giving it gas - does just fine and speeds right up. Sometimes when putting it into reverse, it acts like it will stall, but then does fine. Today while driving at 60, I let off, it jerked pretty good (but stayed driving fine afterwards) and the service engine light came on. I got to the store, turned it off, in and out then started it back up with no service engine light, but still the jerking.
It just had gas in the air intake - and was a bad fuel regulator under the intake. Replaced that and air filter, new gasket. Before that and after, it had an odd idle - so I replaced the IAC valve. Same thing happening - and cleaned out some of the passageways in the throttle body. I'm at a loss - and didn't find anything on a search of the forum. I searched the net and it showed those two things (IAC, fuel regulator) and I just got a throttle position sensor to try tomorrow. I could be way off but at a loss.
Any ideas would be appreciated!
