Owners Forums for Ford and Volkswagen MPVs / SUVs

Hi
Could somebody point me in the right direction. From cold start after about 3 miles the MIL light will come on and the fault code is always P1364. Last Monday the light came on after 3 miles I turned the light out and then proceeded to do 195 miles from Kent to Devon, the light never came on again, this included two stops for about 30 minutes each. The light then comes on the next day after cold  start after the obligatory 3 miles.
 I have changed all 6 coils with genuine units, and have changed number 4 with another new coil, I have also replaced the coil multi plugs which were soldered and heat shrunk. The problem is always the same it comes on after 3 miles, I turn the light out and it never comes on again on the journey until the next cold start. The vehicle is a 2001 2.8 vr6 auto. Ignoring the light it doesn't seem to misfire or hesitate and returns reasonable fuel consumption.
The reason for changing the coils in the first place was that the plug seals on the cam cover had failed and the plug holes were filling up with engine oil, the previous owner had put silicone sealer round the coils and they were heavily contaminated with oil.
I am assuming it is a wiring fault, but why doesn't the light come on again on the same journey,it just does it from the first start up. Thanks in advance. Raymond

95% sure the PCM does control the ignition on these, I would be looking at a wiring fault - it could be that the warming engine makes the insulation flex or something like that, I've had similar problems in the past where it's intermittent caused by thermal expansion.