Hatzisryan

hey guys im having problems with the etc in my 09 fg xr6 (non turbo) ute it comes up with etc and then the pedal does not rev at all until I disconect the battery for a while then it will only work untill I turn the car off again I had the same issue a while back I got a pedal from the wreckers and the car ran fine for 1 month then same dramas any ideas?