Help with stalling 1991 Buick LeSabre

I have a 1991 Buick LeSabre LE 3.8 that stalls running hot or cold, while driving. Engine runs rough, engine light always on.

I have replaced the following:

Throtle Position Sensor (New)
Idle Oxygen Sensor (New)
Crankshaft Position Sensor (New)
Coil Pack (Used)
Spark Plugs & Wires (New)
EGR Valve (New)
Transmission Oil & Filter
Solenoid in Transmission checked and its OK
Catalytic converter checked and is good
computer and chip changed (used)

Does it start right back up? What is the code in the pcm?

It does start right back up again. It isn't giving any codes. I also changed the computer. and it helped alot

If the cel is on there must be code stored, no?

at the begining lot of code ,changed all parts,but last time I checked no codes at all and engine light still on and stalling

If the cel is on something is wrong with the pcm, or maybe do did not switch over the prom from your old pcm?

computer and chip changed (used)Hey Max (Shep) If I read the first post correct, he changed the prom, so now we should ask, why he still has a CEL & what it is??
and engine light still on and stalling

What year did the chip come from? And are you sure you don't have a vacuum leak... This was an extremely common issue with the L27 Tuned port as they aged... As well how did you set the TPS as they are adjustable on the 91-92 models..

Still no code since installed ,another computer of same year and number,the other computer I installed I have less problemes with it, only the stalling left, will check vaccum leak