my brother has a mercedes diesel, i believe late 80's, and it has severe power issues. it will barely idle and has no power what so ever when you push the skinny pedal...however after a while of no power the turbo starts getting fueled and it runs great....until it drops down to an idle again. he has put new injectors in it, new air filter, and fuel filter. any ideas?

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Drain the fuel tank and clean the tank strainer. Also make sure no air is flowing through the primary fuel filter.

ForcedInduction's Sig:

1982 300D VNT Modifications: M-Pump, Garrett GT2256V VNT turbo, A/W intercooler, W115 300D intake, straight pipe exhaust, #265 nozzles, 2-micron Baldwin fuel filter, W126 Gen-II 300mm brakes, battery relocated to the trunk, HVAC systems removed, 15mm rear sway bar, 3.46 diff and Mobil1 15W-50 synthetic oil.
Everyone needs to read the Magnuson-Moss Warranty Act of 1975 (link). Know your rights!