If anyone encounters an STR or XLR that revs to between 3k and 45k and starts clattering, cutting out (misfiring) and then possibly falls on its face save a lot of unnecessary wast of valuable time and first after pulling codes to determine which bank or both banks have faults remove the front 02 sensor from that cat and drive the car before moving forward.
LESSON LEARNED
I have become real familiar with the Jag R systems

 

LOL! Whoa! Slow down here...what happened? Please explain this scenario again...I'm interested.

 

Please refer to my other thread 05 S Type R Fuel pump shuts down