Hi, I have a 1.6 tdci focus, lately after about 5/10mins of driving in really cold weather if I pull off from lights or a round about it looses power as I change into second! To the point were I pull over and it stalls. It starts straight back up and 9 times out of 10 it runs perfectly after that, once it did it again straight away but then drove great. Just before this started happening I had the alternator changed by a friend that knows a bit about cars (I haven't told him about this just incase its him who broke it and he did me a huge favour so don't want him feeling bad). He removed a peice of kit that sits just above the alternator that has a few air hoses connected to it and I swear 1 of them had a little split. I can take a pic of this part in the morning as its dark now. To help the only way I can explain the problem is like when you used to have a manual choke on old cars and you left it out for too long and it hesitates!? Hope this helps. Thanks a lot if you can help!!

have you checked for any error codes?

No I haven't actually but I can do tonight. I'll post the results on here with a pic of the part I'm talking about.

Don't forget to reset your error codes then drive around and check after the error returns. Just to make sure you don't have any old codes in there