do a comp test. if there is a cylinder down then the comp test will show it up.
but you would have to have some seriously low comp to make it stall, i mean it would be misfiring real bad and blowing heaps of blue smoke. it would also have no power.
i doubt that this is the cause of your problem. i would be looking harder at the suggestions here before doing anything else. i sounds like an idle control or vacumn leak problem......not engine internal problem.
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