It sounds like you either:
1. wheels/tires that are not balanced properly (most likely)
2. bad wheel bearings (very dangerous)
3. Have a cylinder misfire
4. Have warped brake rotors
A tire/wheel shop should be able to narrow down the problem
SOURCE: Car is shaking at idle and then 60 mph
BAD SPARK PLUGS AND WIRES DIRTY FUEL INJECTORS AND STOPPED UP FUEL FILTER OR WEAK FUEL PUMP WILL CAUSE ENGINE TO SURGE.
SOURCE: 2002 explorer idle shake & no rev
bad intake not enough air to the cylinders, spark plugs could be a prob, or ur car is running to lean...i hate a similar prob with it shakeing when idleing but i just tap the gas and it stops
SOURCE: shakes at 60 mphexplorer xlt
Tires would be the 1st place to check. If you seem to feel it more in your legs then it is likely the front, if felt more in seat bottom then could be a rear tire. Depending on how severe the vibration is there could be a tire developing a tread seperation and should be checked right away. A simple balance of the tire and wheel assemblies may be all that required also but when on a balancer they should be able to tell if the tire has a more severe problem.
Driveline components could cause vibrations also however if the above sounds like it fits then check that 1st.
SOURCE: 2006 Chevy Cobalt engine shakes real bad taking
Have the throttle positioning sensor an maf sensor chk/ cleaned. Good Luck.
SOURCE: The car shakes really bad about 40-50 mph but when
you are apply torque to the engine upon pushing on the gas pedal so the law of nature states the engine mount maybe broken
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