My car has had a drastic loss of power lately, could be a lot of things I know, but I'm getting ready to put headers on and when I do new plugs, wires and o2 sensors and see what happens. Thing is I've had some valve noise, but after doing the valves yesterday I notice the fluttering noise I thought was the valves seems to be coming from the intake, any ideas? Am I screwed? Could this be the loss of power?