i have a focus st3 56plate and i have a liittle problem with it! when i start it from cold it does not start straight away it has to turn over for a while until it fires up and then when it starts it idling a little high and sound a bit lumpy! when its warm and you go to start it again its fine.i have taken it back to days twice and they have twice said it does not show any faults and seems fine. do these cars have a cold start type valve or has anyone heard of a fault like this? i know it sounds a little petty but its getting on my titts now.