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heat is on? I recently purchased a Mercury Grand marquis and it shutters and shakes a bit when it's idling but only when the heat and blower is running and it's not constant. About every 20 seconds or so, its like something draws power from the belt because it slows down and the RPM's drop from...

...heat is on? I recently purchased a Mercury Grand marquis and it shutters and shakes a bit when it's idling but only when the heat and blower is running and it's not constant. About every 20 seconds or so, its like something draws power from the belt because it slows down and the RPM's drop...