I have a 2007 Ford Taurus that s idling on its own?

I have a 2007 Ford Taurus that s idling on its own? - 1

Assuming we have turned off ignition? Then engine can only carry on turning over by burning some form of fuel. Often this is oil due to worn engine or fault within allowing oil to be drawn down into cylinder bores and heat in them ignites and causes it to 'burn' thus we get an rough sort of idling on own. Often a faulty valve guide seal cam allow that but is rare.
ideally a diagnostic check.compression test needs to be carried out.

As it should. It should not need help to idle.