Ford focus the 4th cylinder on my focus is misfiring _ ive been told it is ok to drive - is it safe to drive and what needs to be done to sort it out

Hi, yes it will be safe to drive but you might have less power.

If its petrol engine then the fault could be a spark plug ot spark plug lead these will need to be replaced its best to replace all four at the same time to ensure you have no problems with the others.
The other problem it could be is the engine management now this is very expensive to buy but easy to replace.

hope this is some help to you let me know if you have any questions or if your car is a diesel if it is then it could be an expensive repair.
Let me know how you get on ok.

If you are unsure then leave it to a garage as they have a machine that clip onto the leads and tell them where the fault is and what the cause of the problem is.
This isnt expensive to get done and it will tell you the problem strait away hope fully its something simple like plug and leads.