If th vibration does not occur at 700 rpm, then it might not be a fault with the engine mounts. As the idling speed id dropping, you need to check the idle contrls.
Cleaning the throttle body and Idle Air control valve might work.
Bad engine mounts would result in the engine jerking when transmission is shifted to D or R. Visual inspections would require you to check for breaks at the mount rubber.
If the Check Engine Light is indicating, get a free scan done at a free scan done at Autizone and let me know the EXACT trouble code.
Sunday, August 29th, 2010 AT 3:25 PM