Escort, RS Cosworth,, 1993 cc, 1992-, Engine Code N5F

Ignition data

Escort, RS Cosworth
Ignition system type: El-ecu
Ignition coil make/type: Mot/-
Supply voltage: 11.0 - Volts without ballast resistor
Primary resistance: 0.72-0.88 Ohms
Secondary resistance: 4500-8600 Ohms
Distributor make/type: Mot/
Contact breaker gap/air: n / a mm
Dwell angle: n / a Deg
Ignition Timing - unleaded: 16/900 Deg eng/rpm (without vacuum)
Ignition Timing - leaded: n / a Deg eng/rpm (without vacuum)
Timing mark location: Pulley
No 1 plug location: O/S/F
Firing Order: 1-3-4-2
Spark plug make: Motorcraft
Spark plug type: AGPR902P
Electrode gap: 1.1 mm

There you go. 1.1mm

If the plugs don't cure it then the phase sensor would be the next thing I'd look at like Woodford says.......