Car is running great...weather is great...I've got a week off...so I took the roof off and used my 944 as my daily driver. It's fun to drive, after all.

Anyway, yesterday night I get in to start it and it takes a little longer than normal to start...even when it's cold. No biggie, it starts but it runs strange...like it's on 3 cylinders. Today, there is a strange knock/tick that only happens at the end of the rev (on the way down) and it comes from the front of the engine (or so it seems). Still runs great, but there is a definite power loss in low rpms...

What happened...