Sounds like a fuel starvation problem to me. Check your filters, I bet you have an algae attack and the filters are clogged. Same experience I had.

How much fuel is in the fuel tank right now? I bet it isn't full.

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84 300DT Puke Yellow. Totalled after 438,000
84 300DT Orient Red. 169,000 (actual mileage may vary)
2002 Explorer EB (wife's)