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I would be suspect of several things causing that misfire code. A common problem on the M111 engine is the plug wire ends, they corrode and cause misfires. I replaced all four of mine at 160K and they were in pretty sad shape. M111's also tend to have leaky valve cover gaskets (A bear to DIY, btw) ands I have seen oil pool in the plug well causing a misfire.
P0304 is not a typical code for AMM.
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