downhill101@comcast.net wrote in message news:<fdjaovki5stg8ehlhdd81qprd2dogf69hn@4ax.com>. ..
> I have a 1990 Accord 5spd that is vibrating when sitting at an
> idle.When I step on the gas and increase from the idle (750 RPM) to
> about 1000 RPM the vibrating stops. From what I have read, it sounds
> like I might have a broken motor mount. I checked the motor mounts and
> they all look ok Anyone have any Ideas. thanks Jim

It's problem on sensor. Like Idle sensor which forsees the conditions..
The sensor is a computerized like chip.