i've had an idle prob for about 2 months it's been back to be fixed twice and still not sorted. runs fine when first start it up but after about 5 or so min of driving it will idle funny. revs jumping up and down between 1000 and 300 rpm.
It's had a new idle controle sensor and a new maf so i have no clue what else it could be. a mate (who drives a scoob) said it could be the warter temp sensor . if anyone else has any clues it woulb be very helpfull thanks.

PS: sorry about spelling

 

Tell us a bit more about your car first...year/spec/mods etc etc,
Fitted a dump valve lately??????????????

Kev

 

it could be the Lambda sensor if not the MAF

 

Sorry mate its a 99 uk turbo. and no would not go near a dv if u paid me

mods full de-cat green fillter and lightend fly wheel

 

Lambda sensor. Sounds like what mine was doing a couple of years ago.