Wow what a waste of money. With all that sitting it could very well have some plugging in the fuel system/injectors. I'd put a double dose of seafoam in with a full tank of gas, ride it some to circulate the seafoam through the injectors, let it sit for at least a day to soak any stubborn clogs out, then ride the rest of the tank out. Be sure and open the throttle up some to get the best cleaning effect. And it wouldn't hurt to temporarily disconnect the pc to be sure thats not the issue.