I was having the same problem over the past couple weeks. I seafoamed yesterday afternoon and it hasnt stalled since. Hopefully that fixes it.

 

Normal idle in gear is abot 700 or slightly less.
Clean your t/bosy, make sure to srub it good and wipe out all the old crap.
Might want to start looking for vacuum leaks next.

 

Update with fingers crossed. I cleaned out the throttle body, added seafoam and used 1/4 can of deep creep and so far so good. Two days with no stalls.If this continues to work I will be a Seafoam champion. After the Seafoam the car runs much better and is much smoother. I couldn't believe the difference. So right now we are doing good thanks to all the great help. Thanks to everyone and I'll keep you updated!

 

I forgot to add that I found the idle control valve at Advance for $45. Saved close to $100 on the part.