recently my acura started acting a bit strange. as soon as i start the car, the engine makes some sound that doesnt seem to stop, and the car now slightly vibrates. also, when i shift gears (from reverse to drive) i feel the engine shifting now, where as before it was smooth and i didnt feel anything at all. what do you think is wrong??actually i just needed to change my spark plugs =/ im a noob lol but thanks guys =]