astra 2002 , 1.6 , 8v , starts idles but wont rev ?

hi , my 2002 astra 1.6 8v , starts 1st time , idles perfect , but wont rev , was running great parked it up went to it in morning and no throttle response , have changed , throttle pedal , throttle flap motor ,checked timing marks , even changed ecu , still the same , idles but wont rev ,no voltage at throttle flap , if you open flap by putting feeler gauge in it , it will rev , help ,