2001 Chev S-10 stored and now won't start

I've been storing my truck since I baught it in 01, never had a problem before with starting it through the winter months, until this year. I will admit, over the years I have been bad with not conditioning the gas during the winter months over the years, this year was no different, so I'm not sure if that is the problem. Basically one day I went out and washed my truck at the local car wash, upon finishing the was, my truck would not start, kept trying to crank it for a while and finally got it to run, drove it home, ran rough when under a load. Got it home, turned it off, and it would not start again, it sat for a few hours, put gas treatment, anti-sour treatment in and it started fine and strong after that. Took it out the next day and got new gas, mixed with the old gas in it. Put it back in the garage for a cpl of weeks, started fine and strong, 2 weeks later, won't start again, just cranks. Any thoughts?? I've tried putting gas conditioner in it again, and fuel system treatment, with no results. I'm in dyer need, I have a 3500 pound paper weight sitting in my garage and can't afford $100/hr diagnostics.