This car as proven itself to be extremely reliable.
Though there is a little rust on the bottom of the doors the black paint still shines good.
I had to replace a TCC solenoid. (auto transmission). and a stater. both were at around 123000 miles.
The car has great get up and go. Also, the 3.1 V-6 is very reliable. A friend of mine has 190,000 miles on his 1990 Lumina Euro. and someone else form school has 250,000 on his 1991 Sunbird LE 3.1.
I believe I'm having problems with my auto transmission. When I step on the gas, the engine boggs down and doesn't change gears. Is this the problem you had when you replaced the TCC?