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Proper running of these cars is really dependent on the condition of the battery. They have a draw on voltage even when parked and if the battery is not in top condition you will have issues of non start or irregular operation.
Get the battery checked and then get a Battery Tender. Keep it on a trickle charge and that should eliminate most of the grief.
I left a interior light on, did not see it in the daylight, damn dead batt,never know check everything.. I leave my car sit sometimes days at a time, mine stays charged, good luck