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This is often caused by a dirty throttle valve and Idle speed control motor, please do the following service to cure this issue.
Get a can of Throttle valve cleaner (it is made by CRC) from the local auto parts store, spray it into the air intake of the running engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speeds problems you may need to seek the help of a professional.
check all vacuum lines to make sure none of them are off especially the one behind the throttle body and also try some STP gas treatment in the gas tank make sure you have aleast a half a tank of gas when adding it and then finish filling it up
Try cleaning the throttle body. Basically buying a can of throttle body cleaner, spray the throttle body and clean with a paper towel. Then you could also replace the spark plugs and EGR valve. Of course check/replace the air filter. Good luck
You need to clean the air bypass valve and the throttle body, they both cause this stalling concern due to sludge buildup, you will need a can of carb spray, remove the air intake hose from the engine, have someone hold the idle up while you spray about half the can into the intake manifold, shut off the engine and disconnect the battery for 5 minutes to clear any codes that have been set, reconnect and drive a day or so, this should cure your issue.