could be a broken engine mount.
A 1994 Corolla engine may vibrate if the motor mounts need to be replaced. The motor mounts can be purchased at any auto parts store.
Fast idle motor is not working. This is allowing the idle to fall below the threshold of what it should be when the A/C is on.
the motor mount is bad
motor mounts
loud, and shety muffler
It is idling. This is hard for an engine to do smoothly.
Could be time for a tune up.
Kinda sounds like motor mounts. The rubber in the mounts does rotten.
The most common cause is tire out of balance or bent wheel.
rubber bushings in motor mount worn
Yes. Totally! If the engine mounts are bad the whole car will vibrate and run bad. Get it fixed.
Loose motor mounts.