morning all.
i have just joined this site and hope someone can help me solve the problem i have with my focus....the fault is as follows.......
when the vehicle is cold (first thing in the morning) it will fire up and idle for about 30 seconds and then cut out....but will restart straight away.... if you rev the engine whislt stationary it revs cleanly and you can hold the revs and they seem fine..
after a few minutes the revs become very lumpy at idle and when you try and rev the engine you get no response and have to play with the throttle and then it appears to clear and will rev..
i have carried out a diag and the only code indicated mass air flow sensor...this has been replaced but its no better..
i have also replaced the plugs and cylinder head temp sensor....i have also replaced the pre cat lambda and even dissconnected the cat to ensure exhaust wasnt blocked...i have also checked the cambelt timing and this is spot on.........

CAN ANYONE HELP ME!!!!!!!!!!!!!!!!!!!!
regards
marcus