RPM problems

[mrsep48]

I have a 04 Corolla, it ran great for a while, but now i have a vibration when im driving it shakes me out of my seat, I have taken it back to the dealer several times, they change my motor mounts, telling me thats the problem, no it still vibrates, has anyone else noticed this, also, when i turn on the engine, the RPM's are high, it takes several minuets to rev down, is this something anyone else has, I will be interested to hear from anyone, because its like banging my head on a brick wall

[bbsgarage]

it will idle around 2k rpm when forst started until it warms up.

have you had the tire balance checked? does the vibration happen when driving/sitting still/both?

[mrsep48]

Car has 46,000 and it is well cared for by the dealer. They do all my scheduled maintenance, etc. 10 months ago they replaced one of the motor mounts as I noticed a vibration. The vibration did not go away. If I drive 70 mph or the car is parked with the engine on, the same vibration is felt even with the A/C on or off. This vibration is annoying and has the service Dept at a lost. They have put in their report that the car has a higher than normal vibration. In the meantime I am waiting to hear from the district service mgr.Has anyone had a similar problem and or any suggestions? Help...