deadmanbelial

Hello all, I hope some one can help me out. I have an audi 90 quattro 1988. Just the other day my center cylinder started acting weird and I am getting a weird noise coming from the intake manifold. I put a scoped the block and head and cant really hear it but I scope the intake valve and I hear the racket. The car is now pumping black smoke out. Could a blown Cold Start valve caue this? The middle cylinder is not firing and the plug us very fouled up so I am thinking the csv is wide open. I am at a loss. Any one have a clue? Also the car starts hard.