So when I get up on the freeway going about 70mph and up I am getting a lot of shaking in my steering wheel and pedals.. Got my tires rotated and balanced and their is still a good amount of shaking.. For the second problem, if I hit a big bump in the road my car will jerk to the left and that stuff is not fun at all in traffic.. Any ideas??
Jack up the front of the car and put it on jack stands.
Have a friend grab the tire at 3 and 9 then shake it. Check you tie rods (what connects your knuckle to your steering rack) see if the out side or inside are moving.
Now have your friend grab the tire at 12 and 6 and shake this will show if your ball joints are bad.
IF you have movement and both or these components are tight it'* your wheel bearing (which is common on big GM cars)