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Technican: The first thing you need to check is a for faulty spark plugs or wires then check for a vaccume leak.
even a leak in the fuel system will bring those symtoms.
it is possible that the burnt wire shorted out a wire connected to the emissions control system.
the alternator would have nothing to do with your idle unless it a bad alternator and is not charging that would cause rough idle and maybe a shutdown when you turn on the headlights
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