Cold start runs smooth till it warms up, sounds like the idle control valve or the egr system which are known to produce this behavior.
Easy way to strat is check all your spark plugs.jeeps are also known for the crank positioning sensors going bad.another possibility is the oxygen sensor
Wouldn't that set a check engine light if a sensor is bad?
my crank sensor and cam sensor went bad at the same time on my 1998 jeep grand cherokee laredo and it did not make a code appear.i ended up putting a new cam sensor crank sensor computer starter and battery and new plugs now it runs like new.i hope this helps
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