I HAVE 4 2009 4000 MULES I MAINTAIN AT WORK. ALL OF THEM HAVE THE SAME PROBLEM-THEY CONSTANTLY STALL. THEY START FINE BUT STALL AFTER YOU COME TO A STOP OR IF YOU REV THE ENG THEY STALL. THEY RUN FINE IF YOU CAN GET GOING. I'VE CHANGED PLUGS,AIR FILTER, ADJUSTED THE VALVES. I DON'T HAVE A WAY TO CHECK FUEL PRESSURE. THE DEALER SAYS IT SHOULD BE 41-46 PSI AT IDLE. I'VE CLEANED THE SCREEN ON THE FUEL PUMP AND EVEN TRIED REMOVING IT ON ONE-I PUT IT BACK AFTER A DAY TO SEE IF IT MADE A DIFFERENCE. THEY SAID WITH THE KEY ON FOR 3 SECONDS I SHOULD GET 1.7OZ OR MORE FUEL OUT OF THE LINE. I GET 2.5-3OZ ON ALL 4 OF THEM. THE DEALER SAYS THATS FINE AND MY PUMP IS PROBABLY NOT THE PROBLEM. ALL THEY TELL ME IS ETHYNOL IN THE GAS IS THE PROBLEM. IF ANY OF YOU HAD THIS PROBLEM AND FIGURED IT OUT I WOULD REALLY APPRECIATE SOME HELP.---THANK YOU