hi try to help my son he has a 996 3.4 gt3
the throttle does not respond with a code p1504,
have changed maf sensor, had a replacment throttle peddle,
the throttle body has been off and cleaned,
if you switch off and floor the throttle when starting it does start to work,
think i need to changethe throttle body? does move smooth but thinking internal pot is failing?
you owner have any ideas?
would like some sugestions
rob