3.3 flex revs then dies

Howdy. Got 99 Grand with a issue. It'll run fine then you come to a stop light and it'll die. try to start it and it'll rev to 2000 rpm then drop to almost nothing then rev again then die. It may do this once or 2-3 times. If you keep your foot on brake and give it gas you can keep it running put it still revs. Once at highway speeds it runs normal. When you get home or wherever and shut it off for awhile it'll start and run normal. Had it in shop twice. No codes. Replaced pvc valve and hose, fuel filter. They said start replacing stuff till it stops. I don't go there anymore. Another shop said unless it does it for them they would'nt know where to start. Of coarse every time it does it, by the time I get it to shop it runs fine. I can do brakes, axle shafts, bearings but electronic fuel injection stuff still baffles me. Any help thoughts would appreciated. Thanx
Stumpy

No codes? Need to check the fuel pressure.

The Idle Air Control valve (IAC) does what it says only when your foot is off the gas pedal. Would that apply to your problem? It's bolted to the throttle body.

96 grand voyager se cut off or idles rough at stop sign or red light or while driving down highway its has 3.3 6cl motor and has no check engine light

96 grand voyager se cut off or idles rough at stop sign or red light or while driving down highway its has 3.3 6cl motor and has no check engine light

No need to hijack a thread and on top of it, post your problem twice.