Check Engine light; loss of engine power even with throttle pressure, mis-fire on 2003 Ford F-250 Super Duty

All at about the same time my check engine came on and my truck began to lose power and mis-fire and when I pressed heavily on the throttle the truck would not respond or took some time to respond to the throttle pressure. I have 195K miles on my 2003 F-250 Super-Duty 7.3L V8 Diesel Turbo;what could cause this to happen?

Asked by for the 2003 Ford F-250 Super Duty
2 answers
Have a diesel mechanic scan test it to see where to begin the diagnosis!
poss inj pump put as stated get proper diag