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high miles and blow by gasses can build up...dealerships charge to clean and service throttle bodies...

also, make shure pcv is clean, etc...

also

everyone should have a manual for their vehicle, and a professional shop manual should be available at the library in the reference section--you can make copies of the necessary information...good luck :)

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Q: Why would a 1993 Jeep Wrangler YJ 4-cylinder have oil in the bottom of the throttle body?
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