I developed a undetermined rattle coming from the engine at low rpm's. It's not an overly loud rattle but I'm concerned. !sad If i throttle gentle while at stand still I can hear the rattle kick in about 1500rpm then dissapears about 2500rpm. Due to engine noise I can't hear it above 2500rpm. Also reappears while reving down in the same range. I only noticed after pulling away quite fast last friday and it's really bugging me. ~ Has anyone get any advise to what it might be (chains, valves, etc.).