Ford fiesta 2003 automatic keeps revving up when engine is started and it does not stop

[beder]

Hi Everyone! 
I have a 2003 semi automatic ford fiesta, and when I start the engine, it revs up to 2000-3000 straight away, and unfortunately it never goes back down! I haven't used my car for a week now due to not being able to get an auto electrician out with this virus at the moment! I cant drive the car, as soon as I put it into drive or reverse, my car shoots off, and I dont even need to put my foot on the gas pedal ! It is extremely dangerous! Any ideas as what the problem could possibly be? Thank you all

[Dan62]

Check the vacuum pipes around the inlet manifold. The PCV hose between the engine block and the inlet manifold is the usual suspect for splitting.

[IHateTheMK7.5Fiesta]

Could be the throttle body is on its way out. Quite common once they get to an age.

[wilkinson]

Had an Escort 1800 Ghia which exhibited this problem. Turned out to be a faulty idle speed control valve. Don't know if they have one on your car but you never know!!