1985 300D Turbo loss of power

[Terrell]

A couple of weeks ago my super strong and powerful 300d tubor mercedes experinced a marked decrease in power. I cannot get above 70MPh on a flat surface. Here is what has been done: replaced primary and secondary fuel filters, replaced fuel tank strainer and replaced all 5 injectors and added two cans of lubo molly diesel purge all to no avail. What is going on here and how do i get my diesel power back? thanks for any help. BTW, the last speeding ticket i got in it registered at 105MPH.

-terrell