Chevrolet: 90 Chevy Lumina Stalling, chevy lumina, crank sensor

Question
Keith,
I have a '90 Chevy Lumina that in the past two months has begun to stall on me.  I have had it stall while I've been driving going 30mph - 70mph, while on a full tank of gas or only 1/4 of a tank.  I'll be driving and it doesn't matter if I'm going up a hill, down a hill, or on level ground, without any warning it will suddenly stall.  So then at that point I'll pull over to the side, and every time I'll go to restart it and it starts up without any hesitation.  It has stalled on me after I've only been driving 5 miles or 200 miles.  I can't seem to find a common denomenator of when it stalls on me.

Since it has so far started up every time for me, it hasn't caused me any major problems, however it is definitely a nusiance and gets a bit nerve wracking if I'm driving on the interstate and it stalls.

I've taken it to two different mechanics who have looked it over, hooked it up to their computers, etc and neither have been able to find anything wrong with it.

Do you have any ideas of what the problem could be or have you ever heard of this happening before?

Thank you,
Aynsley

Answer
Hi Aynsley, these types of problems are very hard to diagnose. I was shop forman for 9 years and I have seen some top mechanics stumped with these problems. The reason is that when the car is running the problem is not there, it only there when the car shuts down, when it starts up again the problem is gone. I have seen the crank sensor be the most common cause, but there is lots of other things to cause it too. The best thing that could happed is for it to not start, Then it would be easy to find. I hope this helps you if you need more info send me the engine size of your car. Regards, Keith.