Lately, I've been noticing a loud, kinda rapid, clicking noise coming from my engine bay. It used to only be temporary, and whenever I had the car idling, but now I notice it even when driving at low speeds (dont know about high speeds, hard to tell). I tried to figure out where its coming from, and it seems like its from behind the engine.. almost sounds like the intake manifold. I'll press the gas pedal slightly when its in park, and when the engine revs, the noise goes away for a few seconds and then when the RPMs come back down, it starts.

Anyone ever have this before?

Oh yeah, 96 Honda Accord