Thanks for the replies. Before I rushed off and started replacing bits, I decided to watch the problem over the last few days.

Interestingly, the missing when cold only happens when dead cold from overnight. We are in winter here in the southern hemisphere, but as I live in the subtropics, our overnights are only down to maybe 7-11 degrees Celsius - not cold at all.

So whilst the morning mis-firing continues until the car is warm, if I leave the car parked for 8-10 hours at work and the temp gauge reads at it's coldest, I can start the car at the days end and drive off without a single mis-fire.

Does this narrow any of your previous views on what the cause may be, down at all.

Thanks in advance.

Richard Zammit