Hi guys,

New to the forum and Fords so please be gentle

Bought a Y reg Fiesta for the missus last week. Its a 1.25 16v zetec. When driving home after buying the car, noticed some hesitation when accelerating. I thought maybe the spark plugs are on their way out so I then replaced them (NGK TR5A-10, same as the ones fitted to the car previously). Took the car out for a spin round the block - all seemed fine i.e. car accelerating as it should. The car was then parked up. This was 2 days ago. Started the car this morning and it was idling rough and the engine management light's come on as well. I then checked all four cylinders for spark. Here's what I found:

Cyl 1 - weakish spark on plug side. OK spark on the coil side
Cyl 2 - strong spark on both plug side and the coil side
Cyl 3 - same as cylinder 2
Cyl 4 - No spark on either side

I am thinking coil pack has gone kaput - however, reading up on this issue suggests that it could be a faulty ecu as well. Need heeeelllppp guys