the motor starts and idles just fine. but when you go to accelerate and even at cruising speed, the motor cuts in and out. it will run fine, then cut out for about 10 seconds then run fine again. it will do this off and on. but after running it for 15-20 minutes then stop for half an hour or so, then start it back up, it will work fine for the rest of the day. i've cleaned the fuel system and filters.