Okay, I had the truck tuned up, it works like a new truck. Thanks much for your help. However, after the tuneup, the cruise control drops speed and there is no air blowing aout of the vent. Air comes from below, but not the vent. Both of these things worked before I took it to the shop. Before I go back and bitch at the today, can somebody tell me what might be wrong, I suspect Vacuum hose???.