Tranny Issue Help!!!

[ffdbrooks]

So while driving my Tow/Haul light started flashing and my truck stopped pulling. So I pull over and turn the truck off after several times trying to press the Tow/Haul buttom to get rid of the flashing Tow/Haul on the dash and to get the truck to pull right. I started the truck back up and it drove fine. The next morning on the way to work the truck was fine for about 10 miles and then the same thing happens. I turn it off and restart it and it drives fine again for almost 15 miles. Any idea what this is?

[brianperk2008]

I dont know what the problem is but my used to do that consistently when I got Deisel from Sams Club, stopped going there and after a few tanks it pretty much resolved itself. It sucks cause it kills mpg cause it would run pretty high rpms over normal when the light was blinking.