over reving

[emz]

when i start my car it revs right up and it doesn't really come back down. when i reverse it revs badly and when i change gewr especially into 2nd and 3rd it over revs. does anyone have any ideas?

[mintalkin]

first check that all the vacume pipes from throttle body to cylinder head are ok with no leaks as this would upset the maf and produce a rich mix then it could be a throttle position sensor problem or its voltage /idle controlle valve requires cleaning you dont say how high the car revs,on 1999-2000 2L zetec e engines there is a known fault with the idle air valve which also causes over revving