I’m fighting through a number of issues on my 1999 xk8. The latest of a long line of issues is I get performance restricted showing up for a few minutes then it goes away. I read my IM monitors and I get P0328 and P0333. I recently replaced the rear tires but had to use my spare for one of the front tires. It’s very old and hard. The only reason I bring this up is it started at the same time. Is there any chance it’s related? Besides tracing wires does anyone have any suggestions on what to look at. I find it really odd that both knock sensor would fail at the same time.