hi i just got a 1997 cl 3.0 164k mi. it ran perfectly smooth but now its been running a little rogher not as rough as the 4-cyl accords do but still a little rough.i can feel vibrations through the steering wheel at idle and in drve or reverse is that normal? because idk if it is or if its just me being too picky. the only reason i ask is because i dont usually abuse the car and i drove it hard the last couple days and now im noticing stuff like that and also i can here the valves tapping in the back of the engine but the front ones are quiet. are the back louder on acuras or is this just another lazy mechanic that only adjusted the front? any suggestions would be great.