98 regal motor knocking

i had my regal for a year now, but just recently it started knocking. sound like it is come from under the intake manifold. it olny does it when the car get up to temp. also gets hard and faster when you hit the gas. only if its warmed
up. does any buddy have any suggestions. please

Welcome to AF. This could be anything internal, if you are unfamiliar with this type of issue, get a pro to listen to it.