I have a Fiesta 2000.A good car with no problems,except this last year the engine when I slowed or came to a stop would rev very high,at first I thought it was the accelerator sticking.When I checked no it seemed okay.This did not happen every time I drove it ,just occasionally, then more regular. I replaced the accelerator cable and it seemed okay,a little slow dropping the revs but it was better than previous.Then it started again. I took it to a local garage,had it serviced and a new cable...everything was fine for a month or so ,now it has started again, I am thinking now it is the automatic choke. Any technically minded people can advise please