The reason I think it is a vacuum leak is because my sister's boyfriend has a Bronco with a 302. I cleaned the throttle body and lubed the throttle cable, cleaned the IAC, and adjusted the TPS. Still no fix. So I go to work with the carb cleaner when the engine is running. I noticed a difference in the idle when I sprayed it between the upper and lower intakes. I poked at a piece of gasket that was sticking out and it changed idle again. So I changed the gasket between the two and it idled fine from then on.
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