also check, vaccuum hoses for leaks, clean the MAFS, and CHECK THE TPS, check injectors/fuel rail. All things couldve easily been found suggested in the 50 trillion idle problem threads that have been posted on any car forum in the world.
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Buying/Selling on TR is like shaving your ass before going to prison. You know your gonna get fucked, you just try and make it as pleasant as possible.