front wheel hop (crazy feeling)

[fastwillie 696969]

DRAG RACER please check in ,when i driving down the hwy and if i jump on it ,sometimes the front wheels feels like there hopping left to right ,almost to the point the truck is uncontrollable until i back off the throttle then it stop and i can continue cruising
this happens when i launch off the line too get about the 1/8 mile and then the wild ride starts until i get off the pedal .

my set up in the rear is coil over adjustable springs .4 link ,rear tires 31x18.5 x15 pressure set to 30 lbs
front suspension cpp tubular a arms with springs and cpp front shocks
i try different setting on the rear shocks .no difference ,

maybe I'm just reading to much into this ,maybe i just need to power thur it or i just run 1/8 runs

any help would be appreciated