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Engine miss on boost

Engine

Vehicle Information: Year: 1976; Engine (Size, Modifications): 3.0 L; Total Mileage: 77,000;

I have a 76 930 with an engine miss while on boost. The turbo builds pressure from approx 3000 RPM to 5300 RPM, at that point the engine feels as though it "cuts out" on all cylinders for an instant and then pulls to approx 5900 RPM where it flattens out and slows down. I have replaced plugs, plug wires, injectors, ignition CD unit, and have cleaned and checked the waste gate function. The engine has 2% to 5% leakdown rates.The engine will rev to red line without a miss if RPM and load is light w/o boost. Where should I look to repair this problem? Thanks.

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