Runs Rough (lugging) when accelerating at low rpm 97 5.0 AWD

[Ozz1967]

My truck runs pretty well for 190K miles. 97 5.0 AWD


The issue I am having is that the truck seems to lug/buck a bit at low RPM ( under 2K rpm) when accelerating.

The truck has 1yr old cap/rotor, plugs, plug wires and fuel filter.

The trans fluid has never been replaced since I've owned it but still looks fairly pink. It doesn't smell burned.

Also from 30mph - 40 mph, it seems to be rough (I can feel it in the floor boards). I recently replaced my front prop shaft (I ran without one for about 2 years) to get my AWD back because I moved back to a state with snow and I don't know if if this vibration is due to the new prop shaft, the fact I"m not used to how it feels after 2 years of running without one, or some other issue (front diff bad?)

Any thoughts and imput are welcome. Th anks!

 

[97-5.0]

Check fuel pressure, Rev it and see if fuel psi drops under 30psi, should Never be under 30psi

And give you Ex some love and change all fluids to synthetic before the snow falls!, or at the least just change all with fresh stuff, even the transmission, smell means nothing