1987 300D - recent purchase - poor acceleration

[sandbagger]

I recently purchased a well maintained 1987 300D.
The car is lacking boost/acceleration when starting from a dead stop. Once I have reached 50-60 mph, it accelerates fine.
Any ideas?
It has been well maintained. I am somewhat discouraged.
I have owned several 123 bodystyle diesels, but I am a complete rookie with this vehicle.
Any help would be greatly appreciated!!!