I have a 99 f-150 4x4 Off Road edition with a 5.4 . it has 82,000 miles. I just bought a camper and it seems to me that the truck losses a lot of power even on slight incliens. is this common for these trucks?"
The camper is only 3800lbs

 

I had a 1991 with a 351 (5.8) and it did the same thing when pulling my 3950lb. boat. I now have the truck below and it pulls liek it isn't even there.

 

You should lock out OD when on inclines. This will put the engine up into the power band more and should pull better. Works for me!!
Jimmy

 

Same exact setup as you. Felt the same way. Keep it out of od.

 

Was down in Myrtle Beach a couple of weeks ago for Bike week and while down there, my buddies bought a 23' trailer. I pulled the trailer with 4 Harleys in it, and 5 people in the cab, and my truck pulled it great.

1997 F150 5.4L 4x4

 

I thank you all for your information. I did take the truck out of overdride, this helped a little. over the weekend I replaced the fuel filter and spark plugs. I believe the filter was an original from Ford. When I opened it up I was surprized that gas cluld flow through it. I have not towed since the changes but just by driving it now I can feel a big difference. I am sure my changes will help.
Thanks again.

Dfeuti.