Engine vibrate in idelling and some clicking noise

[Gary!]

I have a 92' 300E, NOT 24v engine, when the engine is cold there are some clicking sound, and definitely, is connecting to the engine, because when I stop the car with engine running, it still here, but after few mile drive, it dissappear... what is going on? or where is most likely it come from??


and beside of that, when in idelling, the engine have some vibration, and is happen suddently, not constantly. and is not follow any frenquancy things... could anyone kindly tell me what happen??


Thanks in advance!!

Gary!