hi all my name is carol and i am new to the site!
i joined hoping somebody could help me out as i do not know what is wrong with my ford fiesta.
the car revs up and down on its own - not when moving just when the car is still. sometimess when the car is going really slow the engine will cut out due to this revving up and down.
i have had it to a garage 3 times and they have told me it was the air flow valve or something - this has now been changed twice and the problem is still there?
any help appreciated. thanx

need more info, what car is it, could be ECU, anyway some better people than me on here will help you, anybody ?

ford fiesta 1.2
setec engine
n reg

Mines a brand new XR4/ST and it does the same thing, I'm going to mention it when it goes in for it's first service.

Must be to do with the ECU in some way I reckon.

I had this exact same problem with my old ford fiesta and clio. I think it's something to do with the plugs and leads. Maybe they need a clean or replacing to stop the lumpyness in the idle. I dont think its ECU related.

Could possibly be your idle control valve. I had a similar problem on a saxo i had. It did it to the point of stalling and they replaced it and fixed the problem.

My idle speed has a mind of it's own too. Sick of mentioning it to the Ford garage.