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I have 99 Jeep TJ with a automatic trans and a 6.0 liter engine. The engine does not want to idle down properly, running about twice as fast as it should. I have cleaned the carb port. This seemed to work for a while, but now engine runs fast all the time. What could it be?
 

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Binding linkage, a vacuum leak. What carb port did you clean? The engine is EFI isn't it? Do you have any codes? More information would be a help.
 
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