what would make spark plug 3 and 6 not to fire and van to run sluggish

2001 PONTIAC MONTANA
152,000 MILES
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BIG DAVID 52
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what would cause a 2001 pontiac montana mini van to run sluggish and make the check engine light to come on and the smell of fuel real bad and the van motor starts to shake
Sep 13, 2012 at 6:06 AM
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KHLOW2008
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What are the trouble codes the the Check Engine Light indicating?
Sep 13, 2012 at 7:27 AM