does any body know if the 3.8 liter motors from gm had a problem with always running rich. and if they did would it cause them damage if they computer was reprogrammed or the chip was changed

If you have a exhaust leak between the heads and the O2 sensor the engine will run rich. If the O2 sensor is old and getting clogged up, it will run rich. Damage from running rich long term is the cat. It will over load and heat up, and then it'* shot.

how can there be a leak in between the heads and the O2 sensor, the sensor is on the exhaust manifold. but i will try the sensor because it could definatly be clogged

There'* a few gaskets between the heads and the sensor, 2 exhaust gaskets and 2 donut gaskets, not to mention the EGR

The exhaust manifold to head gasket or a crack in the 92-95 manifolds, which is very common to have happen.

oh crud well im gonna check the sesnor first and hope that is the problem thanks for the info guys