Just purchased a very clean 2000 s-type with 51,000 miles. Car runs great with 1 exception. When idling, it surges from 500-1200 rpm. When in gear (D or R) it is ironically like a cat pouncing. Looks like there was a throttle body replacement by previous owner. Does this point to needing a new tps, throttle body or something else. Also, I got a gearbox fault warning 1 time last week, but the car did not run any differently and has not come back on since. Thanks in advance for the help. Great forum.

 

Welcome to the forum.

Get codes read, free at Auto Zone, Pep Boys etc.... Most likely you have a vacuum leak, today is your lucky day. Take a look at the following link, BE SURE to read and understand the link in the first paragraph. Click on it to reveal how to fix by Gus.

https://www.jaguarforums.com/forum/s...ics-faq-52720/

 

Awesome. Thank you.

 

Do you recommend changing coil springs while in there?

 

No, but better take a look at the muffler bearing.