Buick/Olds: 1989 Buick Regal stalls when cold when put in gear, crank shaft, crank sensor

Question
This is the only time it stalls, if you let it warm up for 30 seconds it is okay. Brand new plugs,wires, and tps in last six months. AIC also seems to work okay as I put on a/c at idle and it keeps the same rpm. What else can I check and how ?  

Answer
I'll share with you a "layman's terms" approach at finding your intermittent problem. Having read your description of the intermittent problem you're having, although a faulty crank sensor, ign module or fuel pump can cause intermittents, most often when they fail they will let the engine not start long enough for a tech to find the culprit; by your description I would be more suspecting of the ECM (brain), as I have witnessed this type of failure on numerous occasions and each time I was able to duplicate the symptom with a "tap test". Here's the test, however crude it may seem, do it anyway, so here goes. Access the ECM ( I think your model year uses a black ECM with cooling fins on the outside....I don't recall the location of the unit, if I were at my shop right now I'd look it up for you). Remove it without unplugging the wire connectors and start the engine. Tap with one hand on the outside of the unit with a force no larger than a clap of your hands when cheering for the Sooners ;).If the engine falters at all, have the ECM replaced...can't do it yourself, as the Dealer has to program it with software before it will run. Hope this helps, if not, let me know.
My first guess would be that crank shaft sensor.