[theFREAKnasty82]

You could one of three things wrong; 1) your plugs are severly worn and/or not gapped properly. 2) You have a vacuum leak or 3) Uneven or low compression. From what you said earlier, you have a vacuum leak. Best way to find that leak is to spray a mist of water on the manifold until you see bubbles forming. When you see those bubbles, you have found your leak. That or it's possible that the gasket worn torn when it was installed.