This weekend my 2008 VMAX HPDI Series II didn't run right. I'm on my way to the dealership now but wanted to see what yall thought the problem might be. Motor runs PERFECT up to about 5700-5800 RPM. Once you get above there it's like it is getting starved for fuel. Sort of on off, on off. It's almost as if you were getting on and off the throttle. I figured my fuel bulb wasn't pumped hard so I pumped it a few times and tried again. It did it again. Each time it would stop and run perfect if I just backed off the throttle a little. Any ideas? TIA