The 5.9L V8 is a very thirsty engine. Its JTEC engine computer doesn't help much, in that regard, either. They tend to do excessive WOT enrichment if the throttle is depressed more than 1/3 open. Maybe there's some easy way of advancing ignition timing on it? Might also consider some sort of clamp circuit on the throttle position sensor, to make it not do WOT enrichment.
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