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I didn't have as severe a problem as you but my '93 LT1 was sitting for about a year and I had to drain the gas. It was missing on the top end and failed emissions testing during idle. Draing and new gas cured the problem.
More than likely your the your filter solidified and you may have a clogged filter screen on your in-tank fuel pump. The suggested gummed up injectors may also be a problem.