I have a year old 17 HP Kawasaki engine that idles irratically at the lowest engine speeds. Used to run smooth at these same speeds (low throttle). Engine runs well up top, clean filter and oil. Anyone think this thing needs a carb screw adjustment or valve adjustment? I looked for the mix screw on the carb and didn't find one so I am not sure what to do next. I may take this to the dealer but it will cost me several $ I'm sure. Any help please?