Clean both the Throttle Position Sensor and Idle Step Motor,
responsible for your idle speed:
http://members.cox.net/wilsond/tb/tb.html
God Bless America, Bill O|||||||O
http://www.billhughes.com/

wrote:
>
> This is an annoying, intermittent idle problem with my
> 1993 Jeep Grand Cherokee (5.2L V8).
>
> The engine will start just fine but the idle RPM will almost
> immediately drop to zero with the engine of course stalling.
>
> Giving extra gas in idle will not keep the engine running
> for long. The RPMs swing up and down in a fight between
> wanting to stall and the extra gas but it always stalls
> out within a few seconds.
>
> If I can get the transmission in drive and start moving
> before the engine stalls, the engine behaves just fine
> and I can drive as normally. Within a quarter
> mile or so of running, I can even idle at standstill
> with out problems.
> However, if I turn off the engine, the idle problem will
> very likely return immediately.
>
> This problem is intermittent and it can go months with
> no problems. When this problem occurs, it will
> persist from one engine start to up to a few days.
>
> I'm worried that one day soon I won't be able to get
> it into drive and will be stuck.
>
> Does this look like an idle flow sensor probelm?
>
> Thanks for any help in this.