I carried out all of the above jobs, and there was a slight improvement in the overall running of the car. However, the intermittent idle problem remains, as well as the occasional enrichment. I re-cleaned the idle control valve, spending an hour running an entire can of carb cleaner through it until the fluid ran clean. The result of this was to give the car a more stable idle, but at 1500 RPM. (Slightly higher than before.). I then took the car to a technician, and asked for the throttle switch to be checked, and a full search for air leaks to be carried out. The idle valve was cleaned for a third time, this time under pressure. No air leaks were found, and all electrics were working as designed. The tech found the plunger to be sticking in the fuel distributor (removed in the search for air leaks), so this was cleaned. The net result of all this was a slightly variable idle of about 800 RPM in drive, and very occasional bouts of enrichment, only under full throttle. The technician told me that he believed that the solenoid windings in the idle control valve were on the way out, but he suggested that this could be lived with for the time being. The car runs better overall. However, a new fault arose, or maybe one that was being “masked” by other faults which have now been resolved. During deceleration, the engine would “kangaroo” between 1000 and 1500 RPM. My car is a European model, so I thought it might be a faulty decel dump valve that Steve Brotherton has referred to in other posts. This part is only GBP 10.00 approximately, so I thought I might as well order it. I decided to bite the bullet and order a new idle control valve at the same time. The decel dump valve is on back order, and will arrive next week. I fitted the new idle control valve last night, and now have a perfect idle of approximately 500 RPM in drive. Not only that, there was no “kangarooing” during deceleration, in fact no hesitation at all. I took the car out for a long and extremely enjoyable drive last night, on motorways and country roads, and she ran superb. There was just one instance of enrichment, but this is a separate issue that I will be addressing shortly.