HI,

Our focus has been running fine but has just developed a misfire/roughness and loss of power. It is drive-able but sounds rough and feels awful. Initially the Check Engine light was flashing, on 2 seconds approx / off 2 seconds approx, now it is permanently on.

I have checked for air leaks, loose connections, nothing appears loose or dropped off, plugs look fine and compression is good across all 4 cylinders.

Any ideas what I should be looking at next, any obvious suspect items which could casue this?

Many thanks,
Andy.