My 2002 Crew Cab 4X4 has a problem I don't understand. My Check Engine Light came on, AutoZone tester say's it is the Throttle Body. At about the same time my Heater / Air Conditioning Selector quit working, Air blowing from all outlets at once. Would a bad hose cause this. The truck has less than 100,000 on it and I can't believe that throttle body shaft is worn out. Any help is greatly appreciated.