When warmed up while driving it stalls for a second then takes off again

I should have added to my question: It will continue to keep stalling every few minutes, then I might be able to drive ten miles before it happens again.

Today I started it and within a minute it idled down and stalled. Temperature gauge had not even move yet. Do you still think it is the temperature sensor?

It still does not show a code. I am not using a cheap code reader. I am using a scan tool that does ABS brakes and a lot of things, some I am not even able to understand yet.

Yes, I checked. Let me add. When this started, I drove to O'Reilly's. At that time it showed a code for MAP. I got a new MAP. No change. They could not clear the code, so that is when I got my own scanner. And when I was there, the parts man said, clean the MAF. I did, no change. New air filter, no change. Next new crank shaft sensor, no change. Next, a used ICM and coils. No change. Yes, I was careful and used MAF cleaner on the MAF. Used dielectric grease on ICM, After cleaning every thing up. I have looked at many sites on the net, just found this site. I want to Thank you. I'm seventy and don't have a lot of money. So I hope you will continue to help me to get to the bottom of this. I have worked on all my cars over the years, and this has me stumped.

Sorry I was not clear when I asked the question. I changed the MAP. Cleared the code and it has not shown a code since. I did not think that was the problem as no code came back after I changed the Map. What I wrote was the steps I took after it continued to act up and quit running. I hope that this clears up. My mistake in explaining the problem.

Also, each time I changed a part, I drove the car about 17 miles, stopped at a store and returned home. Sometimes it acted up right away, other times, not until I slowed to come in to town:" The very first time it did this, " I had drove about 30 miles to another town, drove back about 20 miles, stopped for gas. Started the car to finish the last 10 miles to home and it shut off right away. And several times on the way home. To repeat, shut off for a second, restart itself with a jump in the RPM's and a jerk. I hope this will help in finding the problem, This is very rural, so the towns are 10, 17, and 30 miles away. So this is mostly highway speeds. And as I explained, the latest I started it and within a minute it idled down and shut off. This was when you asked about the temperature sensor. It always starts right back up. As a normal start up. Hope I have not confused you again As I wrote early this morning and thought I should add more detail. Thanks

So how do I check the map circuit?

Ken This mess is over. To review. When my car started to stall, I went to ORielly's. It showed a code for the MAP. New MAP sensor. O Rielly's could not cancel the code. Bought a diagnostic tool. Canceled code. It stalled, no code. Talked to the guy at O Rielly's, said to clean the MAF. Bought the special cleaner, it stalled again. Next new crankshaft position sensor. No code again. Next I changed the ICM and coils, it stalled. Talked to several other people, went to a do-it-yourself salvage yard. Looked at about 15 cars with a 3.8 motor, guess what was gone on them all. Mass Air Flow! Finally found one! Put it on and not one time has it stalled since. Did not clean it or anything, cleaned up the metal that it sets in. Put a little dielectric grease on it and off I drove. Save you money on the cleaner, when you show a MAP code, replace the MAP and go ahead and change the MAF at the same time. You can buy a cheap one on ebay and don't have to pay hundreds of dollars at the parts store. Every place I looked and everyone I talked to said, "it did not surprise them, that it never showed a code again. Hope this helps all you 3.8 GM owners out there. And I want to thank everyone at 2carpro's with all of their help. Pat

I was sitting at a stop sign when the car shuddered and stalled. I tried to start it, it would start and immediatly stall again. I let it sit for about and hour and the car started and ran fine for about 25 miles and the process repeated again. Also the service engine light came on. What could the problem be?

As soon as I remove it from park and place it on drive it shuts off completely.

It also does it when I place it on reverse too