1995 3500hd 6.5TD rough idle & black smoke

[teg_b18c1]

One of the company trucks I maintan at work is a 95 Chevy 3500 6.5TD 16' stake bed truck 2wd.

It get's very little use we have put only around 25000 miles on it in 5 years. But this thing a has had a TON of problems since we bought it. It has had a new PMD, glow plugs, (2) injector pumps, lift pump, air pump, transmisson, A/C compressor, wastegate solenoid, and more.

Well today I started it and it just rev up to 4000rpm and died then I started it again and it idle about 2000 rpm then started to jump from 800rpm to 1500 rpm. If you touch the gas pedal it will rev very high then almost die. It is pouring out black smoke. The truck has 155,000 miles on it don't know if it has ever had injectors put in it. But the truck ran good last time we had it out which was about a week ago. I limped the truck around the parking lot it was a 30 degree out friday when it first did it and put it in the heated garage. It is about 65 degrees in the garage today and it is doing the same thing. What could it be? injectors? TPS?