Check tires for blisters, or tread separation and tire balance.
Check your shocks and make sure they are connected also wheels for bent rims.
Check out wheel bearings and wheels are evenly torqued with all lug nuts.
might have misaligned or loose wheels
the cuase of this is ussaully worped rotars
Could be a problem with your torque converter
Cylinder miss, broken motor mount, or vacuum leak.
Cylinder misfire. Possibly failed or failing engine mounts.
The ISBN of Hover Car Racer is 1-4050-3621-4.
The engine of the car may need to be cleaned or your oil may need to be changed.
have front suspension checked
Normally this is caused by a tire out of balance or a bent wheel.
because the alignment is off Warped or out of round brake rotors/drums.
i would really like to know myself
Normally a bent wheel or tire out of balance.