I have a 1988 jeep cherokee inline 6 that will drive all day but around 2000 rpm its like some one turns the key off and while its coasting I can turn the key and it'll start right back up.......I don't know what to do to find the problem

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#1 cause of this is a flaky "crankshaft position sensor".

It is the most common sensor failure on the Jeep 4.0

If you buy one, get it from Jeep; worth the extra money. There is no shortage of threads with people having reliability problems with certain (not all) aftermarket crank sensors.

 

Thankyou I actually checked it out and the wires goin to it were resting against the which was why my jeep was mainly doing it on hot days

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gotta love an easy fix!!

 

Hmmmm well I went ahead and replaced the cps because it started up again but its still doing it

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The next two suspects (in this order) would be the ignition coil and the ignition control module located underneath your coil.