Pulling a grade yesterday and lost power big time , nothing over 2500 RPM .

Even when I limped too the top of the grade onto level ground .

Only after I babied it home cooled it with water over the radiator , turned it

off and let it set 10 minutes . Then fired it up and revved it a couple of times

did it finally kick up past 4K RPM . Question ; O2 , MAP sensors injectors

or fuel filter or pump ?. Where would you start to look for the problem ?.

Truck was warmer than normal when running

extremely dry air 7-9 % humidity but never got close to boiling over . it's

normal temp position is between cold and half , yesterday it was half way straight up .

Thanks Luggingalong