ooh, come to think of it I have EXCESSIVE unbalanced bowtie tires I mean really unbalanced! I think theres an art to assembling these rather large mt wheels which im yet to learn (used to glued and trued 10th foams). sorting them out was low on the lists of priorities, getting the engine run in was at the top. while I was doing the wot process with the truck on the bench rpm was low but the vibrations from the wheels were hi, i could see the head of the engine trashing about.
I guess its not direct vibrations or as frequent such as an unbalanced engine but its vibrations non the less, maybe resonant to the glow plug wire who knows
