I have a ping or clicking under the hood when from 0 to about 30mph on 2005 Mercury Grand Marquis

Probably more like a rapid clicking. Idling seems ok. High speed seems ok. Engine sounds ok when idling. noise comes more when i accelerate. once it gets over 30mph it seems to stop

Asked by for the 2005 Mercury Grand Marquis
seek daig and est
Thats it