i have a 97 f-150 v6 w 115000 miles. sometimes after driving for awhile when i stop the engine idles rough & wants to die unless i gas it a couple of times.it clears and runs smooth like usual.it has new plugs & is in great tune besides this problem. anybody know what the problem could be. i dont get a check engine light.

 

sounds like your IAC sensor you can run a scanner and there may be a code stored it just has not hit as a hard code yet and turned the light on. also check all the ports to make sure they are not clogged.

Lance

 

Possible MAf sensor.
possible IAC.
Possible vacuum leak (PCV hose maybe?).