Got my fiesta puma still running rough, runs fine in high revs but coming down in revs between 2000 and idle it hunts for an idle eratatically which causes the car to jolt really badly! It also doesn't pop on the overrun anymore! I have replaced lambda sensor, plugs, maf, idle control vavle, throttle position sensor injectors rail! Its gt no fault codes, been to the garage no air leaks etc! Can anyone help getting to the point were its gna have to go!