Hello Patricia Kennedy.
Besides a dirty air filter... listed below... idle air control valve... the idle speed is pretty tamper proof...
If the car has not been tuned up RECENTLY... that would be a STRONG recommendation before fine-tuning the idle speed.
The problem I am seeing ALL OVER the web... is the idle is too fast... (absolutely will cause STALLS).
All things being reasonable... your tachometer should show an RPM OF 650 to 1000 rpm... above that is quite EXCESSIVE...
A real TUNE-UP MANUAL would be required to properly set the SPEED ... but only after EVERYTHING had been serviced, cleaned and replaced...
Tuning up a car with DIRTY FILTERS & WORN spark plugs is an WASTE of MONEY!!
What I am seeing EVERYWHERE... is a HIGH IDLE problem... (above 2000 RPMs... That will ABSOLUTELY cause your car to stall at a STOP... because your TORQUE CONVERTER is designed to lock up (quit acting like a clutch)...
If your idle speed it above 1000 rpm... that WAS a BIG RECALL issue for GM engines...
Check out the links below... a high idle can stall an engine better than a low one...!!
Comment me back if I am not being particularly clear... or wwatch some of the videos I have attached.
Good luck.
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