Chevrolet Repair: hesitation/stalling, minimum airflow, buick skylark

Question
I own a 92 buick skylark which has 132,000 miles.  Whenever I park the vehicle for a short time, such as a trip to the store, I get back in the vehicle to drive away it will stall a few times.  It also happens in the morning, even if I let it warm-up for 10-15 minutes.  I have taken it to a few shops but they cannot make catch it in the act, so they say.

Answer

Integrator Hey Michael.

 It can be really tough and frustrating to diagnose intermittent stalling problems but there are some things that can be checked and serviced quickly.  Remove and clean the IAC valve (Idle air control) and clean the back and sides of the throttle plate.  Air bypass for idle control is based on minimum airflow and plugged ports with carbon buildup will cause stalling problems and IAC motor sticking.
 Sometimes what happens is when you are driving the fuel trims start to lean out for various reasons driving a calculation called Block Learn super lean.  When you start the car the second time the vehicle can now be too lean for good driveability and not be able to manage idle very well.  
 In the defense of a technician intermittent problems don't always get addressed with too much vigor for the fear of spending valuable shop time only to come up inconclusive.  It happens all the time because driving a car for 2 hours with a computer only to have nothing happen can kill a shop if it happens enough.
 It wouldnt hurt to change the 02 sensor.  If it is original it is way past its service interval and may be getting lazy now.  an oxygen sensor should  be switching between .3 and .7 volts at an idle.  If you have a meter its easy enough to check.  I drew a picture in Paint to try and help you visualize these two important fuel calculations.

Wayne