Hi everyone. I have a focus 2.0 2008 mk2. I have a little trouble starting it sometimes but more worryingly the revs change rapidly for the first couple of mins from 1500 down to 200 and sometimes stalls. Once driving all is well until i brake then it happens again if i am in neutral. Once i stop its idling about 1000 rpm. The alternator was replaced a couple of years ago and seems to be ok when i asked at my mot. Anyone got any ideas?