I have noticed the last couple of times I have had the truck out that after running it a ways and coming to a stop it will.......kind of lope a couple of times when I come to a stop.

I noticed today that when it does lope the fuel pressure goes up from the usual 15-16 pounds to about 20 then thing calm down and is nice and peaceful again.

Just changed the fuel filter today, hoping that helps.

Any other suggestions or possible causes?

Truck runs great other wise (fuel pressure was a little low is why I changed the filter.)

 

could be the CPS(crankshaft positioning sensor), mine did that it got worst after a while, have you checked for codes?

 

Checked for codes after both incidents, non stored.

 

mine has done it for a year now and still runs strong with no codes... i have just learned to live with it.. If you figure it out I would love to know what it was...

 

Just kind of freaky, The first time I thought I had run out of fuel (never done that before), then, last time, I was just pulling off the road into a parking lot and it did it again.

Sets me on edge when it does it, I WILL figure this out.

 

Quick update: swapped out my fuel filter and ran all of my B20 out, refilled with LSD and it seems to be just fine now. (no more Bio unless it becomes a daily driver again).