There is a hill near my home that goes down 3,000 feet from the top, in 8 miles. When I get to the bottom, then stop for a signal, there would be blue smoke from the tail pipe. I paid $18 for a JAG mechanic at justanswer.com to tell me what the problem was. He told me to clean the throttle, and clean the part load breather hose connector. IT WORKED!! Has any one else had this type of problem? I never saw smoke under any conditions, just the bottom of that hill.