my '00 F550 surges real bad with no tune a stock turbo, 4" turbo back and the wastegate hose un hooked, It will boost to 29 psi and EGT will get to mid 1200s. No surge with the waist gate hose hooked up, It will boost to 17-19 psi, but EGT get to almost 1400.
any sugestions?
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