The computer needs to be reprogrammed. There was a recall issued
on this many years ago. I had the same problem and the recall fixed it.
Here's details on the recall:
Re: Throttle Body Recall
Publication No.: 303-S514
Model Year Model Description VIN Range Repair Required
1997 to 1998 XK Series N/A 001036 to 020734 Reprogram ECM
1998 V8 XJ Series (both N/A and SC) 812256 to 819771 Reprogram ECM
1998 XK Series N/A 020735 to 031302 Replace throttle body
1998.75 to 1999 XK Series (SC) 024695 to 042775 Replace throttle body
1998 V8 XJ Series N/A only 819772 to 853935 Replace throttle body
1998 to 1999 V8 XJ Series SC only` 819772 to 878717 Replace throttle body
RE: Throttle closed position operation
A concern has been identified with the throttle operation on a number of vehicles in the above VIN range.
Under exceptional circumstances this concern could cause the engine to cut out, although the engine will continue to be driven by the road wheels through the transmission and drive the ancillaries, so there will be no loss of power steering, brakes, air conditioning, etc. The engine should restart without difficulty once the vehicle
has come to a complete standstill.
Action to be taken
To aid in the identification of repairs required by vehicle, Table 1 [see above] of this Service Action provides a breakdown of the repair required by model year, model description, and VIN range.
For those vehicles that require the ECM to be reprogrammed, Worldwide Diagnostic System (WDS) release JTP759/31, or later, should be used.
You are requested to make contact with the drivers of the affected vehicles and request that the vehicle be made available, at the driver's earliest convenience, for the modification to the throttle operation to be undertaken.
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