Idle vibration when in gear

[john brycki]

When car is at idle speed, in gear, and brake applied there is vibrations in the floor board. If I put the car in nuetral or release brake the vibration goes away. Could it be the transmission i.e. old fluid. The torque is fine. Car does not want to move when brake is applied.

[taxiguy]

is your check engine light on? if not maby check your harmonic balancer the rubber inside could be separating wich would result in a rough idle but smooths out when eccelerating

[dre]

could be a few things but motor mounts/tranny mount could cause that or old tranny fluid. those are the cheapest things to check.