I have a 1997 Buick Skylark Custom, that I've owned since it was about a year old, with a 2.4L engine with about 179,000 miles on it and for about 2 years now it has been stalling when I accelerate from a stop or slow coast and intermittently when coming to a stop from freeway speeds. When I do come to a stop, about 3 out of 4 times, the car feels like I'm stepping on the gas at the same time, like it's trying to accelerate by itself. I also noticed that my mileage has been affect since I used to get nearly 30mpg on the freeway and I'm now getting about
23-25mpg on the average. The stalling is the worst during stop and go traffic, usually I have to sit there and give it a little gas (about 1000 or so rpm) before I start moving so it will not stall. It doesn't seem to matter if I place into park or neutral, it will stall about 50% of the time. Any and all help would be greatly appreciated since I really do love this car.I installed a new precat O2 sensor in March, problems started before that & didn't get any worse after that. The codes I wrote down were P0113 - Intake Air Temperature Sensor Circuit High Voltage (no longer shows up), P0172 - Fuel Trim System Rich (still shows up) and P0440 - EVAP System (no longer shows up). The last (P0440) is just a general about the EVAP canister.
I did look around the groups some more (should have done that first, getting upset with this problem) and found something about disconnecting a 4-wire connector from the TCC. I did this and the car seemed to run better for a bit until i had to sit and idle for a couple of minutes at a gate, then it stumbled before accelerating. The only other thing I noticed after disconnect the connector was that I no longer had any indication of PRND321.