hi all i have a Renault sport on an 03 plate and have a misfire on 2 plug leads on the coil pack their are 4 leads as you know but the 2 back plug leads are showing a fault and misfire on the snap on timing light is their 2 separate coils or are their only one if only one then a coil leed is probable the fault any help please appreciated bazzz ive changed the plugs