Outer Limits 4x4 Board

Hey guys,

My old man has a 92 Disco.... 3.5ltr V8 efi.

runs great, plenty of power until..... he goes up the Maleny hill.....

loses power, runs on 4 cyl, it just dies in the @ss.

has replaced the fuel filter..... wonders if its the air flow censor?

Any feedback from you guys would be great,

Thanks

Dying fuel pump?

but most likely

bad plugs?
bad leads?
bad rotor?
probably not MAF sensor

Regards Philip A