Problem with 99 Escort zx2

I recently bought a 99 Escort zx2, and it runs fine, but whenever i stop at a light, or it is idle, the steering wheel and dashboard vibrate.

I looked on several other sites and read that there is a way to fix it, I believe. But, in order to see how to fix it, you have to pay. I dont really feel like dishing out 25 bucks just in order to see how to fix one thing.

I have also heard that it may be caused by dirty or clogged fuel injectors. Is this true (i'm not a huge car person, so i really would not know myself)?

Please help.

-thanks