Strange Vibration

[Teddd]

My wife was driving the 95 LS 400 home yesterday with the AC on. While she was at a red light, she heard and felt a strong vibration. At first she thought is was heavy equipment nearby, but quickly realized it was the car. The first thing she did was turn off the AC. The vibration stopped. After continuing on from the light, she turned the AC on again and it was fine. I looked under the hood when she got home and everything seemed normal. I'll keep an eye on it, but has anyone had this happen??

[landar]

It is not uncommon for the motor mounts or transmission mount rubber to be deteriorated. Vibrations can be felt when these parts are worn.

[viviangaon]

you may clean the oil tank (carbon deposition) , don't use catalyzer now.

check your throttle is clean or not.

in a word, clean .