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Stuck throttle cable, vacuum leak, stuck throttle plate

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Q: Why does your 1990 jeep Cherokee 4.0 inline 6 cylinder idle at 1200 R P M s?
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1990 Cherokee And sometimes you can be setting at a red light and the throttle will all of a sudden just go wild and suck wide open 4.o with inline six it happens now every time we drive it?

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