1999 F150 4x4 - 4.6 v8 Triton - On the way home one day motor seemed to lose power - 55-60 mph all I could get - seems to sound strong at idle when in park -when in drive it starts to miss or seem jerky - its driveable however will not run at higher speeds - no codes coming up -

 

Have you changed the fuel filter lately? Change it and then have your fuel pressure checked.

 

Have a moderator move this thread to the V8 Engine section, you will have better luck there.

 

Plugged cats?