Today, most people simply can not afford to pay professionals to maintain and service vehicles that develop difficult to find and isolate problems…Obtain a Factory Service Manual or even a condensed aftermarket shop manual and learn how your engine operates and is controlled…The “crack” in the throttle can probably be repaired with an industrial epoxy like J-B Weld but don’t expect a dealership or professional mechanic to do that…YOU will need to develop those skills…