Shop Shark ; I appreciate your imput .Most of this you suggested has been done except compression test and vacuum and timing. When it runs the short 20 seconds or so it is very smoothe and quiet . Check what I said in my post again . It will take a while to check your suggested items but I will sertanly do it . Have to get a vacuum guage and a buddy to help me . Easier that way. When I find any thing out I will post it. Thanks again.

Jerry