random cel and no power

[michaloco]

hey folks.
as title says, if i put the pedal to the metal my truck sometimes throw a cel and loss of power. stop engine and restart will solve the problem, but sometimes the hiccup occurs 2-4 times in a row, sometimes happens nothing a long time. i hate intermittant faults my problem is, here i have no chance to read the codes. any ideas where to start? cps is changed 2 times, oil is new and full. truck starts fine.
thanks in advance...

[Fordman247365]

Sounds like the IPR to me since the CPS has been changed. Is the truck stock or has anything been changed?

[michaloco]

truck ist mostly stock, only mods are 3"downpipe, no kat, no muffler. but problem occured also if it was completely stock.