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Won't start on 1999 Chevrolet Express 1500

My van would start sometime and then at times it won't start, but run good when it does, now it's been sitting for 3 months, and it won't start at all now, but I have 56 pounds of fuel pressure at the rail, I pulled a spark plug wire off and another spark plug on the wire, laid it on the block, look like good spark to me, I spray starter fluid in the air system, nothing ????, I'm going crazy over this van, do I need to check the security system, it don't have a chip in the key it self, any help would be nice, Thanks.

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