I'm sorry if I over looked a thread already about this topic..I just couldn't find something about it.

My car recently passed 100k miles, and is a 2000 civic ex. I've had it for over 3 years and when I got it, it had under 50k in miles. Now when I'm idle I feel a vibration in my seat and steering wheel. This didn't happen until the last 10k or so miles.

I'm over due on a timing belt, and that'll probably get done within the next month. If that doesn't help resolve this problem, what will? Or is it just something that comes with the age of a car?