2010 rzr 800s nightmare please help

Hello everyone i have a 2010 rzr 800s with a severe running issue. I have done my home work i have checked all the basics compression, leakdown, spark, injectors and injector pulse everything is in good working condition when you first start the machine it runs smooth and normal. as soon as you hit the gas it start missing and dumping raw fuel out of the exhaust. there is no change switching injectors or plugs ive tryed new plugs a new ecu and the fuel pressure is good i am at a loss i havent rode the machine more than five miles and then all this happens any ideas would be greatly appreciated :sad::sad: