If these have the same type of overboost protection as the other 87 diesels, you may want to check your overboost switchover valve, switch and wiring. Also check the wastegate hose to make sure you aren't legitimately overboosting.

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Dale

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1990 300D 2.5 Turbo -155k
2000 E430 - 103k
2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k
2014 VW Passat TDI SE - 7k Bro's Diesel
2006 E320 CDI - 128k Pop's Benz

Pre-glow - A moment of silence in honor of Rudolph Diesel