sounds like your tires needs to be rotated and balanced
Wheel bearings and allignment. Can be tires as well and sometimes even a bad motor mount.
I suggest getting your wheels balancedAnd why are you driving that Chev at 70MPH?
Wheel balance, bent rim, bad tire or worn steering components to name a few.
It can BE HURT BY DOING THE HARLEM SHAKE
Yes, either can cause a shake while driving.
by doing the dnce
Maybe its your motor mounts.
bad tires, wheel alignment , bad tierod ends, start with tires may just need balanced...its the cheapest
Yes, when idling and driving.
if your stearing wheal jerks to check to make shure that the power stearing pumps mounting brackets aren't loose mine was loose on my 89 corsica and it was doing that
warped rotor
Nope.