My girlfriends Toyota Corolla, starting that we know of this last winter, has started to sound like a diesel. There seems to be a general lack of power, a slow response, and the car is noisy as heck! This has surprised me for the car is an '02 with just over 100,000 mi. on it! Finally the sound comes even after the engine is hot (1 1/2hr trip), so I don't think the problem is just cold starting. My current thoughts include: time for tune up, timing "chain", and possible just dirty then all get out. If any of you know, or have any idea, what is causing this that would be great.