slow acceleration

First post on the forum so ill try to make this as clear as possible! So I bought my 2009 F250 about 6 months ago and it has been a good learning curve for me. After replacing a few different things under the hood (some of which were pretty costly) I deleted and tuned the truck. With...

I have a 2005 f-250 6.0 that I just recently bulletproofed. It had these same performance issues before & after being bulletproofed. I guess I should back up & say it was a repossession & I only drove it 2 miles before bulletproofing it so I don't know much about the history. The truck has ARP...