I just started my car after it had been sitting for maybe a month. And the head is making a clicking noise im pretty sure (but not positive) wasnt there before. You guys have any idea what it is? I was working on the car and I took of the Throttle body and Y pipe to change the plugs but aside from that I didnt touch the head. The only think I did is add some oil. I tried changing the oil but the noise is still there aside from that is seems fine just noisy? Do the valves need adjustment or something ? My car has 75k on it and a HG was done maybe 15-20k miles ago.