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You NEED a turbo on this thing, at high altitudes you can get all the fuel you want from the injectors and pump you have now but the air is where you're getting stuck, and that's what the turbo will help you big time. Hypermax has a full turbo setup for your E-series, but like any other aftermarket system it's quite costly, so if you're on a limited budget you may wanna look into a used factory turbo from a '93 or '94 7.3 IDI (Powerstroke turbos will not work).
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