Ignition Module Problems of Jaguar XJ8

My 2000 Xj8 begins to surge after the vehicle runs for a few minutes. You must stand on the brake pedal with both feet to keep from surging into another car at a stop sign or red light. The dealer in tucson, az replaced an ac component, which did not solve the problem. The el paso, TX dealer claimed it needed the throttle body replaced. It was replaced. . . No change. Owl automotive changed a spark plug and wire. . . No change. Owl thought the ecu might be the problem. It was sent to technicians who checked and upgraded the unit. . . No change. Also, it did not indicate any problems. Car was taken back to el paso dealer. They stated it needed another throttle body. I contacted USA Jaguar, who contacted the el paso dealer and instructed them how to check the throttle body off the car. The dealer then stated the problem wasn't the throttle body, it was the ecu. El paso jag would not check anything else unless I spent $4k+ to replace the ecu, even though it had just been checked and upgraded. The car is now back at owl automotive having ignition coils changed. If the problem continues the communication cable between the ecu and transmission module will be changed. If the problem continues, the transmission module will be sent out and checked. The car has been in shops for the past 2-3 years. It has been driven less than 100 miles and has been towed 3 times. The car has 38-39,000 miles. The car is dangerous to drive as is. It has depreciated approximately $10k while sitting in garages having attempted repairs. Jaguar does not seem to be concerned about the problem nor focused on repairing the problem. They are only intent on replacing all the components, hit or miss, until they finally solve the issue. . . . . . At substantial cost to me. I had to purchase another car to have reliable transportation. The car cannot be sold "as is", however, it will be my last Jaguar.

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