It seems whenever i'm running about 3500 to 4000 rpm's and press on the gas there's a clicking sound coming from the exhaust, but whenever the rpm's are up it's fine. It's been doing this for about 2 or 3 months now,

any ideas what it could be?

 

Heat shield loose or something similar.

Jack it up and take a look.

Also check the plugs and wires, could be loose.

 

alright thanks, i was kind of thinking maybe the exhaust was loose or something but that appeared fine, and changed the spark plug and wires around 5,000 miles ago.. so they should be still good