I kinda think its a fuel issue. 100 yards wouldn't heat anything up far enough to make it die (electrically), I wouldn't think. Also, to do the spark plug test, if you don't have a spare plug, just get a buddy to hold he end of the wire, but you have to do it early in the morning!! LOL

Might not work any better, but will be more entertaining.
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72 GMC C2500 402/Th400 first truck (still have)
77 GMC C3500 CC dually Sold

70 C50 dump truck "Rusty"
87 K10 Suburban Sold
93 K2500 xcab 6.5TD
96 GMC K2500 Suburban 6.5 TD