I have a m1008 with 20,xxx miles on it and when towing my utility trailer down the interstate at around 55mph for about 1 minute I will loose power and it looks to be bluish smoke pours out of my exhaust, if I let off the accelerator it will go away but if I go back to 55mph it will do the same thing. Ive just being going 45mph and it does fine. Around town it does fine I can floor it and it will do fine just when cruising at around 55mph it happens. It also is doesnt loose power when it it just the truck though and no trailer. I have changed the fuel filter to a screw on filter, replaced all the fuel lines, cleaned the return to the IP, and put a new fuel pump. There are no leaks. Also after sitting for about 1 hour after Ive drove it it takes several seconds to start, but in the mornings it fires right up. Dont want to just keep throwing parts at it till it gets fixed.