what would cause reduced power,30% pedal and only code is p0102 mass air flow

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truck was running fine,until plastic turbo hose came off and I lost power put it back on made sure lock was in place took off and no power and only 2400 rpm and only have 30% engine response with pedal,r&r mass air sensor no change,fuel rail press good,unhooked exhaust to elemenate pluged catylist still no power,turbo has good air coming through cooler but will not spull up power braking