[ColombianMax]

Originally Posted by hermtm2

I was wrong. I brought my car to get air in the discount tire store this morning. They checked air pressure and then made tire rotation because the tires were not correctly mounted. The tires has a specific rotate direction. At the last night I couldn't drive up more than 80mph in the local road. I drive to highway this morning. The vibration is still there between 60 and 70 mph. The vibration is get worse whenever I push the pedal.
If it isn't suspension, I doubt about the passenger side axle which was I replaced at the last year.

ding ding ding.... I had the same problem until just 2 hours ago. I just replaced my transmission mount. As I would drive and give it some gas the car would vibrate until I let go of the gas pedal. hope that is all you need cuz its 47 bucks for auto trans mount and 57 for manual trans mount at idiot zone

If you have an automatic you can test for yourself by getting a second person to help you

1. Pop your hood
2. start your car
3. as someone else looks in the engine bay, hold your break pedal and put your car on "D"
4. Continue by shifting to "R" and just keep back and forth from "D" to "R" and see if the engine and trans move a lot
5. you can also verify by putting it in either "R" or "D" hold the brake pedal firmly and lightly step on the accelerator to see if it moves more.

Try that and report back to us