I have an exmark hp 23hp Kawasaki that is sputtering and shutting off after it gets warmed up for about ten minutes. It really likes to shut off when I have the pto going. I have spent $94 on coils put and with new coils in it and new spark plugs the POS still does it. The impulse fuel pump seems fine b/c I took off the line to the carb and turned the engine over it is impulsing gas. I know its not the safety switches. When it starts to sputter I can pull the choke and it is obvious it needs gas. The fuel filter is fine also, gas flows through it real well. I also drained the old gas from the pan. It is new gas in the tanks, the lil bit I had in the tank had stabil in it. Any suggestions would be appreciated! I called Kawasaki and they werent helpful one bit, very rude and arrogant saying it cant be from the engine. Check with exmark. This is so frustrating having a machine that runs fine for 10-15 minutes but then once warmed up, it just sputters and dies.