Cylinder has spark but not firing..

Here's what I found the other day... http://www.ehow.com/list_7421966_signs-cracked-intake-manifold.html#page=1

The very first symptom is this. "If your vehicle's intake manifold is cracked, it will affect the air and fuel mixture in the engine and disrupt the normal combustion process. The engine may miss, hesitate, stall or just generally seem to run poorly if your car has a cracked intake manifold."

I'm still going to try everything I HAVENT tried this weekend and see what I come up with