idle problems

Having random idle problems. Jeep usually purrs beautifully, but after long grades, it will heat up quite a bit and then when I come to a stop I notice that the idle is anywheres between 1,500 and 2,500 rpm. If I turn off engine and start it back up, the idle usually is corrected. Is there a bad control valve? And is the valve causing my fuel mixture to lean up and overheat the engine?

Help please...

Sounds like your idle air control valve either needs cleaning or replacement.

Erratic idle with ocassional high idle has been a faulty TPS on mine. The overheating may not be related- have you checked your fan clutch to see that it engages? When the engine is hot and shut off, the main fan should be hard to turn by hand.