To all, thank you again for all of your input. I am going to give the tractor another run this weekend when I get a chance (active duty Marine Corps + Farrier + horse boarding + new born baby = not a lot of time left during the week). I think the route I'm going to take at this point is: change the engine oil/filter, replace the Hyd filter (big one under the left floorboard as I sit on the tractor), replace the fuel filter (in a clear filter housing about midway up the right side of the engine as I sit on the tractor?), and replace the outer air filter...and see where that gets me. At least it will give me more of a base line and rule out the simple things. I haven't checked for an EGR yet but if it's got one, it makes sense to replace that too. Does anyone know where I can get the most "cost effective" filters for these tasks?