I have a 99 Ford f350 with a 7.3 and when I'm accelerating my truck starts bucking and surging around 2500 rpms?

Black smoke dumps out and I lose lots of power. I have had several mechanics look at it and nobody has figured it out. I have changed the ebps tube, ipr, icm, one injector, injector o rings, valve cover gaskets, cps and some other stuff. Could it simply be something with the turbo? Feel free to put in your $.02, any help will be appreciated. I have a stock tune it it now, when I put it in tow or extreme, it happens quicker.

Are you going to burn your Ford truck?

I burned my Nike shoes and today I burned my 2018 F250 truck to protest Ford and reported it struck by lightning to the insurance company. Real Americans Stand up to these anti White anti American corporations. Are you going to burn your Ford truck

Is the Ford F-250 a good truck?

My dream truck is the more modern Ford F-250 Super Duty Lariat. Would you recommend on owning and driving one for many years or decades?

Do Vehicle companies lower A trucks/SUV towing capacity for safety reasons?

I have a 1999 Ford F-250 5.4L (Yes I know it sucks) I saw the towing capacity was at 5,000 pounds seems kinda low I've seen videos of people towing 25 foot trailers with this truck. I feel like they lower the capacity down just to be safe and cover their selves which is smart just seeing if I'm able to tow more