My 03 Protege5 is making an odd noise and I'd appreciate any help you can give me.

It's a tapping sound. It is intermittent. Sometimes starts up when I'm at a stoplight, sometimes happens when I start from a stop.

It doesn't vary in frequency with engine speed. When it happens from stop it happens with just the barest throttle input.

It feels like it's louder in the cockpit. I can sort of hear something similar from the throttle body/intake area methinks.

It's super odd. I really am not sure what it could be.