Im not sure what causes it exactly i never have wheel hop though, light up your tires before you go so instead of hopping they will just stick and peel out. I dont know why your guy's numbers are so low it just doent makes sense to me haha, when i had i/h/e cams and ported manifold i was spanking this silver si taht ran a 15.0, maybe i have a factory jem but i talked to some of my friends hopeuflly going to run my car in a couple weeks. Just waiting for the new parts.