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Drifter..its a lousey feeling, I know. Apparently no CEL on/no DTC's set. tec. couldn't duplicate problems = SOL for time being. So...
Fan makes a loud roar when it kicks on, but no real power loss should occur. Sticking t. blades can cause running issue like yours, but so can other parts. Reflashing pcm will not fix a mechanical problem as you may know. Look for updates. Meantime...
Have u considered towing your RV (before trip) around town..up some hills..pedal to metal a few times etc. If it craps out have it towed to dealer. Good luck!
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03 F250 XLT SC/SB 4X4 6L (stock) A/T. SRW 3.73's BD:02/11/03. 01 TL 23' SGII
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