I just bought my first Nitro truck which was a HPI Nitro MT with the Nitrostar .15FE engine. My problem is that I can't seem to get the engine to idle for anything longer than a couple minutes at a time. I tried to break the engine in according to the manual, but I couldn't get it to idle very long. Is this normal? The car runs awesome otherwise. Tons of power and speed, it just won't idle on it's own. Thanks for any input or help...