i got the shakes
 

when i am driving down the highway around 70+ mph my steering wheel and shifter start to rattle and shake. It does it a little when i am at a red light and idleing but since i cleaned my IAC and throttle body and gave it a tune up the idle shake isnt as bad. What should i do to fix this shake? Suspension mods or what

thanks

You might want to check your motor mounts and the alignment. You might also check the balance on your wheels. The alignment and balance wouldn't affect you when you aren't moving, but the shaking is typical of those at highway speeds.