2004 ford 6.0l diesel stumbuls on acceleration when passing at highway speeds

Perform tests in the link below:

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

What color is the exhaust? This link may help, if it's smoking:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-10.html#post1977241

If you haven't been using full-synthetic heavy duty diesel engine oil, the turbo may be bad.