Onan Gen Set 5000 very rough start

I have a 2001 Onan 5500 in an '02 Georgetown. I had cardiac surgery just before Christmas 2011 and didn't get to the "exercise" routine for 4 months. The SOB hasn't run since. It's not a big deal for us as we're FHU site people, but I guess I'll have to get it fixed before we try to sell the rig.

Since it only had 48 hours on the Hobbs meter after 8 years with the original owners when we bought it, I guess they didn't use it much either! It has about 60 hours on it now.