Could be in need of a tune up.
IAC (Idel Air Control Valve)
It may be because the idling unit is broken.
could be lots of things but have you changed you fuel filter lately?
Consumer Focus was created in 2000.
Tomorrow Focus was created in 2000.
You don't. It's all done by computer.
In a 2000 Ford Focus SE : That would be the 2.0 liter , Single Over Head Cam ( SPI ) four cylinder engine
I have a 2000 Ford Focus it uses Mercon V. Mercon V is what I use in my 2000 Focus with a standard transmission. I have an Automatic 2000 Ford Focus station wagon and the owners manual suggests Mercon V.
Program a new key and ignition to a 2000 ford focus
how to remove hub assbley from car 2000 ford focus