mack1

Hi NOVASS2007 and welcome to TSF,

You might have a vaccuum leak. If you don't have a vaccuum gauge, you might just sequentially unplug the hoses and hold you finger over the inlet for testing. (thats the old fashion way, but works sometimes).

Check the PCV, sometimes they stick open causing excess crankcase air and vapors to enter the engine intake.

On multi port fuel injection systems, there is an idle control valve. Not sure the throttle body ones have this valve or not. If so, check it to make sure it is working.

Let us know what you find.

Best regards,
Mack1