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I strongly suggest checking your Mass air flow sensor (or clean it with NON-CHLORINATED brake cleaner) as well as your 02 sensor. If that doesn't resolve the issue check your coils. A simple ohms test will indicate functionality of the coils. With vehicle running, disconnect the mass air flow sensor. If nothing changes, clean and test. No change, replace sensor. There are several ways to test an 02 sensor. The easiest is attaching a volt meter and observing while driving. Another simple way is to remove the O2 sensor and see if the vehicle runs and drives any differently. If so, sensor needs to be replaced! These are the most common causes. Good luck!
well the fast idle is most likely caused by a leaking upper intake runner base gasket, this high idle may be related to the trans no engaging, fix the idle problem by remove the upper intake runners and installing a new base gasket and keep your fingers crossed