Polaris 425 Magnum Won't Run Right
 

I bought a Polaris 425 magnum knowing it had cam problems, and it was also sitting for 2 years. So I replace the cam, fuel pump, carb, gas lines, petcock, and put a exhaust i had laying around on it. But it idles great but when I try to give it throttle it will go but if I hold it, it will want to die, also it will sometimes almost die at idle.