Hi everyone, new to the site!!

My uncle has a 2000 F-350 cube truck he uses for work with a 5.4L in it. Lately the truck has been running with no power (almost like it is a 4 cylinder). It takes a long time to get up to 45 mph and has a hard time going any faster than that. Had him run the codes since the CEL was on and it came up System Lean Bank 2 (no other codes than that).

The truck is going to be coming to my place Monday so I thought I'd get a few of your thoughts on what to look at? I know the plugs and regular/maintenance "stuff" has been looked at and changed already.

Thanks in advance and looking forward to being a part of the forum!

 

what brand plugs does it have in it? check fuel pressure. check for vacuum leaks, especially the pcv elbow on the back of the intake. and also clean the maf. how much weight does he have in the truck? and how much does the truck itself weigh?

 

I'm not sure on the what kind of plugs are in it. I will have to check that Monday. As far as the weight in the truck I know it not more than it can carry for sure. Not to mention that he has had the same thing in it for many years and never had a problem with it before. It is used for fiberglass insulation for new construction houses.