1990 Acura Integra 1990 Integra with vibration

Hi,

I have a 1990 Acura Integra the problem is that when the car is at idle the engine vibrates. When I bring the RPM's up to over 1100 the vibrating stops

However when I turn on any electrical item the vibration gets worse but will still go away at 1100 RPM's.

I have replaced the motor mounts on it but that was not the problem.

Do you have any idea what could be the cause of my problem.

Thanks, Josh