Hi guys!

I am currently looking for a XK8, and I got a really good deal on a XK8 96´, i testdrove it, but ill just tell you what happend and I then hope some of you guys can explain what shall be done, or if I shall just not buy it:

So, everything in exterior and interior is beautiful and in perfect standard, its no problem with chain tenisors or nikosil after what I could see, but, the dealer said it was a problem with the "Traction Control" warning-lamp always being on..
He just backs it out, and I swear it already stalls the engine, we take it out, nice drive and everything, then suddenly the engine stops while in a sleek downhill, I needed to stop the entire car to make it start again. when I turn right, something makes a deep rumbling sound, but nothing on left turns, I also took it up to about 120km/t (60mph) to check for more stalling, and it defiently got problems..
Is this is a easy fix or is this really serious?

I hope you guys could help, I really love Jaguars, and I have a very good deal on it, so if it is easy to fix ill go for it.
Thank you