Ok I bought her 2 yrs ago. Had 102000 on her 5.0 engine. Have done a lot of work. Entire front end. Gas tank. Shocks to load adjusters. Clock spring. Radiator hoses. Recent egr vacuum canister. Changed gas filter. Running much better. But after running warmed up acts like a bucking tiny hesitation acts like wants to stall when stopped. Then runs fine. Getting a little frustrated here. Love the old girl. In really great condition. I only drive her spring summer fall. Could use some help figuring this out. Need to haul more hay for winter coming. etc. Could it have a carbon build up coming loose doing it? Or what? Looked 6 yrs for a truck like her.

 

Hang a fuel pressure test gauge on the rail and make sure you have 30-45 psi present at idle. Pressure should hold near that level for a long time after shutdown.Make sure there is no raw fuel present when you pull the vacuum line off the fuel pressure regulator.Replace it only if fuel is present.Go for a drive and situate the gauge where you can see it when it acts up.

 

Thanks will check that. Appreciate your help. I love this truck. Been really reliable. I expect issues here and there from age. Everything I have replaced is almost all original parts. Including rear drums.