I have a 99 F250 SD 4X4 with 252000 miles and has run well for years. I am running a TS Performance 6 Bank Chip and have enjoyed trouble free performance for years. It may just be in my mind but my truck seems to have lost some pep over the last year or two and I was questioning my HPOP. What would be the typical symptoms of the HPOP wearing out?
to Super Duty Diesel. 