All cars, with a fuel injection system, use some form of idle control valve that lets a small amount of air into the fuel sytem to keep the engine idling when the throttle is closed.
From my experience, this valve is a common problem and is relatively cheap and easy to repair.
Of course it could be a number of things causing the problem, but i certainly think its a good place to start.
the reason it are doing that is because in is ild to low
Sounds like to low an idle speed.
its probably just your idle kicking in when u stop, this keeps your car ideling at a certain RPM so your car dont stall, and die.
It could be need of a tune up or a gas filter.
When the idle goes rough, you must idle the plugs. Else the car plugs roughly.
Rephrase, Idle air control, idle circuit carburetor or
on my 87 Chevy caprice just happen today, my car would idle for a while then die. Turns up my carb was bad. Changed the carb, ran like new again.
The car was staying idle.
no .... no way.
Fuel Pressure is low or the ECU is not able to control the idle from the sensors. If it is an old vehicle without an ECU, you can adjust the idle on the throttle body itself to be higher.
If the IAC was bad the car wouldn't run at idle or it would die when a load was put upon it.
It is a common suspect in contributing to rough idle. See "Related Questions" below for more about the EGR valve, from testing to replacing.