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Having put up with the cutting out (well, reverting to idle) and jerky-jerky for far too long, I at last found time to get the AFM off and have a look at it. Probably around 10 years ago, I'd done the trick of repositioning the carbon track pick-up arms so that a fresh area was swept. Looking at it this time, there's no evidence that the resistance surface has worn through. With a multimeter, I found the resistance track was reading well over 1k ohms for the higher readings. Hmmmm. I've previously done the trick of repositioning the copper contact arms, so this time, I soaked a cottonwool bud in nail varnish remover, and scrubbed the resistance track vigorously with that. Quite a lot of dirt came off; result, maximum readings now around 800 ohms. No jerky jerky....why did I put up with it for so long?! But....question....will this prove to be a reasonably long term fix, or should I be looking at getting the afm reconditioned/a new one? Have had the car since 2003 so I don't mind spending out if it's a worthwhile and long term improvement. As far as I know, it's the original afm, supported by the date code, so it will have "done" around 211,000 miles.