Yesterday is was sitting at a stop light and suddenly the engine began to rough idle. It doesn't stall, but the warning message simply indicates that there is restricted performance. I'm thinking that with 68k miles, it may simply be a clogged fuel filter. I purchased the car about a year ago and have had very little problems, but am not sure when the fuel filter was last replaced.

Does anyone have any thoughts?

Cars & Trucks - Jaguar - S-Type - 2003 Jaguar S-Type