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A valve stuck the up position can be poked down with a bit of prodding with an Allen wrench of suitable length. The valve is off to the outboard side of the spark plug hole - not directly underneath it. You can't both see in the hole and do the poking at the same time - you have to use The Force to do the poking.
Once you've gotten the valve moving up and down a few (dozen?) times, lubricating with MMO between pokes, very often the valve will start working again of its own volition.
(The theory behind this is that rust or carbon is causing the valve to hang up, and getting it moving knocks the schmutz off.)
(You might want to snake a small USB camera down into the plug hole of the sticking valve to see what's going on in there.)
(Also, just as a public service announcement, double/triple/quadruple check that your plug wires are in 1-2-4-3 order! It is incredibly easy to get them mixed up. I have little masking tape labels on my distributor cap and on the plug wires themselves.)
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