1995 buick park avenue 3.8L engine

If it only stalls at idle, clean the throttle-body and iac, idle air control. Check for possible trouble codes. If that is a hybrid datalink connector, I can't help you with that, but, if you can access codes, it will give us a place to start.

If your saying, it only cranks in neutral, you may have an issue with neutral switch?

Thanks for your reply,it stalls at any speeds and when ya shift into neutral it will restart and run fine for a while and sometimes stall ou again. Here are the trouble codes that were found in the pcm. p1629 passkey fuel enable circuit - p1257 boost control circuit - p0703 brake switch circuit - p0501 vehicle speed sensor- p0755 shaft solenoid B fault- p1361 ignition control signal not toggling- p0101 mass air flow sensor- p1619 engine oil life reset switch circuit- p0705 trans range switch circuit. I have also been told that pcm's going bad were a common problem on these cars.

I'd erase the codes, drive it, and see what comes back.

all of the same codes come back.

Why can't you start it in park?

Check voltage and grounds at the computer. I don't think I've ever seen a vehicle with that many codes.

I looked at code p0703, it looked like the easiest. You see the brake switch input and output for the tcc in diagram. Brown wire goes hot with the key on, the switch shows to be normally closed, so the purple wire is hot also, unless you step on the brake, then there is no voltage on the purple wire. I'm talking about the brake switch itself. If everything checks out, and wiring ok, suspect the pcm.

If you want to check any of the other codes, I'll try to help you with that.