Hi! I have a 2004 Snapper ride on with 12.5 hp Intek. I have done many things to this mower all basic service all the way to a head gasket. It still will not start and run right. It only starts at idle. I have to creep the throttle slowly to full speed or it backfires and stalls. It only likes to run at full speed with the carb screw all the way in (clockwise) but it does not idle there. The carb screw needs to be half way out for a nice idle. Please help!!! Very frustrated. Thanks, Mike
