2001 Dodge 3500 quad cab dually. Alright I need some help. We just got my dually out of the transmission shop so I know it cant be that.. I drove my truck the other day and it worked perfectly fine. I came home turned it off and a couple hours later got back in it to take off. When I started to go down the road it wouldn't shift into second gear. So I took it back home.. If you push the pedal all the way to the floor it will shut off not all the time but sometimes. Even when I was going up the driveway it shut off. Speed sensor has already been replaced twice now and I just replaced it again with a more expensive one. This is driving me crazy! Also already adjusted the throttle cable. It may be to tight but I'm not sure. Also the truck is an automatic. Thanks in advance

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also this is a diesel 5.9L