Ecp strange fault

Hi has anyone come across this at all it's a 2011 1.2tsi.

Ecp light and limp mode but not from cold (left over night)

Codes that come up when scanned state low voltage to throttle position sensor. 

Original pedal always in limp mode clear code and on again after 5seconds.

Replaced the peddle with a second hand one and was better will do about 10 miles before going into limp mode Normally only from cold but occasionally it will reset when warm.

Bought a brand new peddle from skoda and normally when cold it will run fine till the blue temp light goes out (anything from 1 to 3 miles) puts the epc light on and will either completely loose all throttle response (turn key off and on again 9 times out of 10 will just put into limp) or put the car into limp mode with reduced throttle.

When the car has no throttle it Revs high about 1500rpm and if you put your foot on the brake it drops to 850-900rpm then as soon as you release the brake it climbs back to 1500.

Video of fault

Has anyone had anything similar or any ideas on a fix?

Hope all that makes sense to someone.