Intermitent idol problems.
I just bought a 2001 Jeep Cherokee with the 4.0 straight 6 engine and O/T. And some times when I start it, it will idol really low and some times die. Also when I come to a stop at a light or something, as soon as I stop the idol will drop down so low that my lights will dim because its not spinning my alternator fast enough, and will some times die. But as soon as I give it a little gas it runs just fine. And it only does it about 60% of the time I'm driving it.
Any ideas?