My 300D turbo diesel revs great in park and neutral, but when I put it in drive and brake torque it (holding brake and reving) it hardly revs at all. Anyone know ?

You have low power, probably due to lack of fuel or air.

Check your in-tank fuel strainer, fuel pre-filter, and main fuel filter.

If this doesn't correct it, check your air filter, LDA (boost compensator) adjustment, and turbo condition.


------------------
Jake