hey i have a 99 prelude, base, 5spd, 51K miles on it, and when the car warms up i get a little vibration on the steering wheel and inside the car..... the idle stays steady though and doesntr "fluctuate" but its just either the motor vibrates a lil too much or something else. Other than that the car runs smooth, pulls during vtec, everything. It isnt a HUGE problem just a little annoying.....I tried cleaning the throttle body, the IACV, I checked the vacuum lines and they are ok, any helpful insight on this would be appreciated. Someone suggested to me it could be a torn or worn motor mount. If this were the case wouldnt it vibrate all the time? If not than maybe thats the next thing I should look into.....

 

just give it time to warm up i guess. check all vaccum lines