1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

idling rough

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Old 11-27-05, 10:43 AM
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idling rough

i just recently noticed that my 85 12a is idling rough what could be the problem. i just replaced the spark plugs and it is still doing it. does anyone know what the problem could be?
Old 11-27-05, 11:03 AM
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The problem could be a vacuum leak. Some recommend spraying carb cleaner around areas that are suspected as having a vacuum leak and the idle will increase when you hit the problem area. You do have to be careful though, carb cleaner is flammable.

It also wouldn't hurt to do a full tune up, and check your timing. A full tune up consists of new distributor cap, new plug wires, new fuel filter, new engine oil, new tranny fluid, new diff fluid, new coolant, etc etc..
Old 11-27-05, 11:38 AM
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I'm a bif fan of checking the resistance on the spark plugs wires.
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