Headin' in to work yesterday, all was well, until it shutdown like the knock sensor kicked in. Not long after, I noticed a new sound coming from the engine. Got off of 33 at Hamilton Rd., popped the hood, and my 2.2 now sounds like a John Deere, or a poor running diesel. No coolant and oil mixing, it still boosts, , did not notice any smoke from the exhaust, and seems to run fine, but I had it towed anyways. Will start tearing into it this weekend, and I hope it's nothing deadly. Has anyone had a similar experience? I'm thinking a follower or something like that has given up. It sounds like it's in the top end.