I did check the idle screw. I had it to where when you pull the glow plug at a idle the engine keeps running with no change in rpms. The fuel lines from tank to engine are new, but the short line on the engines old. I'll change all the lines and see what happens. The head screws are tight, the muffler is tight. I need to check the back plate. If that dont do it I'll tear it apart and see whats going on.