2000 XKR - My car was running great but when I started it up the other morning it ran so rough it was shaking the whole car. I could hear rushing air and it sounded like there was a rattle coming from the supercharger. I have no codes since I probably didn't run it long enough to set any. I have removed the supercharger and it seems fine. It turns freely and the lobes look fine. During the disassembly I didn't find any thing obviously wrong like detached hoses etc. BTW, I replaced the upper cam chain tensioners about 20K ago. If anyone has any thoughts about what might be wrong please let me know.

 

Engine mount
Vacuum leak
Misfire...spark plug
Dirty throttle body
Also possible that head gasket is blown/leaking

 

Thanks, I check these out.

 

Sorry I was on the wrong forum. Reposted at XK8/XKR.