here's the situation...my timing belt is jumping around when i rev the engine past 1500rpm but at idle it is fine. the belt is pretty firm as far as having slack (or not having any slack) goes so im a little confused as to why it would still jump around. it's an LS motor with stage 2 turbo cams and aftermarket gears... so my question is is it possible for aftermarket cams to affect the tension of the timing belt in any way???