I have a 1995 chevy 3500 6.5 turbo diesel and it looses a lot of power going up hills and inclines and only has a top speed of 70 mph could this be a governor problem.

Most likely, it's a turbo-related problem. Make sure the air filter gets changed at least on schedule. I would only use a full-synthetic diesel HDEO in a turbo. People who don't eventually have problems with turbos. This link may offer some ideas:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-8.html#post1415281

I would have the turbo examined for damage.

My son has a 2005 Ford with a 6.0 Diesel and it is running very bad. He pulled up three codes. PR 261------- Pr 273 and P 0098. Can you tell me what these codes mean and a possible fix. Thank You