since deciding to sell my mk5 escort it has got a missfire. i have replaced plugs so far.
the problem is it start to missfire one boost and also once the car is warm it will not start. when its cold its ok but as soon as you go 2 mins down the road switch it off it dont wanna know. now its getting a spark! now i have had a listen to the engine and i can hear a hissing sound from behind the manifold which i think is auxilly air valve. i can wiggle some black pipe and the hissing noise changes tone. now could this be my problem ? i cant find my rs turbo haynes manuel!
any help will be great