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My 99 Trooper (3.5... not identical but very similar) used to do that as well. It never bothered me enough to fix it, but I had to replace the fuel injector o-rings when I replaced a stuck thermostat and it hasn't happened since. (3,000 miles ago) I also replaced the intake gasket at this time, but I suspect injector o-rings as a fuel leak into the engine would increase revs where an intake leak would cause it to sputter/stall since it would run too lean.
 

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Interesting... I'm not saying I found the solution, its pure speculation but I thought it might be a start for you
 
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