Q&A

 Master

Does the air conditioning cool? If the air conditioning is working, when the air conditioning compressor kicks in it puts a load on the engine and the idle speed drops. The engine computer picks up this RPM drop and tells the idle air control motor (IAC)on the throttle housing to kick up the idle.
The IAC gets fouled with carbon build up. Remove the throttle housing intake boot and clean the throttle butterfly housing and throttle butterfly with the throttle fully open (engine off). If that doesn't help the IAC motor needs to be disassembled and cleaned or replaced.