So my mechanic swung by my job today to drop off one of our tractor trailers. He grabbed me out of the office to get him to listen to my truck. I started it up, he was prowling back and forth from one side of the engine to the other. Listening, anaylizing, scratching his head. He hopped in the truck, put it in gear, ran the motor at different speeds in and out of gear, got out, listened to the tail pipe, shut the truck off. Then started walking in circles in the parking lot. I was like, ok.
He said "Give me the keys." I did, and he left, that is all......