I have owned this car from new and it has just rolled over 165,000 miles.A year ago it intermittently started to rev up and down erratically when started from cold,and once on the road it will momentarily falter/hesitate for a split second ,then run normally.Other times it will suddenly cut out while idling,but will start back up ok and then run fine.Other times the car will jerk as the power comes off and on ,and the revs will stay at 1200rpm if i engage neutral while coasting and will finally settle at 950rpm once the car has come to a halt.Now and again the fault light comes on and records "Irregular fuel delivery".I have so far renewed the following ,Throttle Potentiometer/Stepper Motor/Oxygen(Lamda) sensor/Throttle cable,reconditioned ECU. The Master Tech at my dealer has reset the "Auto-adaptives " for me . This car is in excellent condition and drives beautifully 99% of the time,but i really need help with this fault as it is very hairy when it cuts out approaching junctions.