Timing Chain Replace

Um. Yep. I checked it again. It’s still a 2.2L. It is a DOHC Ecotec. My Chilton’s manual lists possible engine sizes for my car at 2.2, 2.4, 3.1 and 3.4. Mine is a 2.2. I don’t know if I should be insulted or not that you think my engine doesn’t exist ;-p. Are you saying my 2.2L DOHC Ecotec is an “interference engine”?

And how do I “track down” a sludge problem?