eh. usually the gas wont have much effect on the idle like that.
i tried looking up the 0507 code but came up with nothing.
have u used the CEL flashing light trick?
http://www.ff-squad.com/technet/how-to/celcheck/here is a list of CEL codes and obd2 "p" scanner codes. maybe i missed the 0507 code in the list but you can check.
http://www.ff-squad.com/technet/ecu.codes.htmhttp://www.ff-squad.com/technet/ecu.codes-p.htm