Gas peddle less than 3/4 down no problem; gas peddle over 3/4 engine bogs down

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Addressing this problem this has been done: 1) fuel system clean out 2) MAF sensor replaced 3) fuel pump and filtering replaced 4) cooling system flush with thermostat replaced Additionally, after engine warm-up complete, runs hot as high as 240+ degrees; ambient temp approx 90+F degrees. The gas peddle position behavior is consistent; always more then 3/4 peddle travel, the engine bogs like all of a sudden there is less fuel being delivered. After $2,500 spent the problem while a little better is not resolved.