Well, just a quick question for you before you take the chance of messing up your pedals..
Are you playing on automatic? Or manual (clutch enabled or disabled)? Because (I believe, I may not be remembering this clearly) with my G25 if I'm playing on manual (without clutch being active) or automatic it will always have the gas on a little as if to mimic an automatic car where if you release the brakes then you have power to the wheels even if your foot is not on the gas. But if it is not that then I really have no idea. Hope this helped.