I have a 2000 integra LS automatic that runs and drives great. I have a very odd issue (or at least new to me). When I am driving and on the gas it shifts great and drives smooth but when I let off the gas it has a weird vibration. It can't have anything to do with suspension or brakes because if I let off and throw it in neutral it doesnt vibrate at all. The vibration is definitely coming from the front end. My assumption is that it is the transmission, but I have no idea what the exact cause is. Any suggestions or ideas as to what it might be?

 

I'm thinking CV joints on the axles - they don't vibrate in neutral because there is no torque on them.

?

 

I had kinda the same issue and found that the trans mounting bracket had lost a bolt and the other one was very loose replaced and it stopped

I have a manual trans so it might be a little different.....

 

check all motor and transmission mounts then possibly balljoints