Thanks for your advice chaps. I had a look at that thread in the Mantara section and I'll check the throttle linkage etc to make sure nothing is amiss there before moving on to the Idle Air Control and Stepper Motor. It is about time I sorted it (after 6 years of ownership!). With my shiny new tailpipes and a trip to Le Mans in June, it is going to get used a lot this year.