Howdy everyone. I have a 2007 GT that I have tinkered with but I can't seem to find whats going on with this issue. When the engine is cold, and if the RPMs are below 3,000 or so, the engine feels weak and the gas pedal just seems to act like it's barely working (very slow to rev up, sputters a bit). When it's warm it seems fine. I have a friend who says it could be misfires. Do you guys have any tips on this?