starting to jerk a bit at 30+ mph...could the belt be going?

[nrg2brn]

I feel a bit of a jerk...about the same timing as maybe a flat spot on the wheel, so very fast...but only after 30mph. almost undetectable, but there. im 200 lbs and WOT it a lot, and take off as fast as possible. am I needing another belt already?

thanks!

[Baizy]

Try a higher grade fuel if you haven't already. It could just be a casual engine knock under high rpm load.