I just done some swapping with a guy and aquired a 460 stroker banshee, the guy told me it was just built a few weeks ago, not even a tank of gas thru it. So I get it home and ride it for about 5mins and now I can't get it to idle, if I'm not on the throttle it dies, I checked the plugs and one of them the tip is melted, he told me to run premium gas in it, but I'm hearing from other people I should be running race fuel? Any help from you guys would be very appreciated!