I have a 2008 RZR. It is missing at idle sometimes. Seems to be when warm or hot. It will sometimes pick up the second cylinder if you get the RPM's up but not all the time. I have tried to pull the plug wires to figure which one is not firing but it keeps running the same way???? Tried new gas have not messed with plug wires nor plugs due to no change in running when I pull the wires. Not sure about fuel pressure just kind of hoping some one had this problem and knows the fix!!