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.

A guess would be a clogged converter. Before spending big bucks,
replace vacuum hoses