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Try putting the alarm into Valet Mode - there's a switch or button on the alarm box, just under the dash on the driver's side, and you push or flip that button or switch, briefly, to activate it. That should clear up the trouble for now, *if* the trouble is only the alarm.
(Frankly, I suspect you may have slightly polymerized gasoline, choking up the engine, causing it to stall out/stop. Some STP or similar fuel treatment, plus some fresh gasoline recently pumped, might get rid of that problem.)