Truck stalls

I had that machine that tells you the codes if there's something wrong with the engine like a diagnostic test I had that done and nothing came up no codes at all I don't have no check engine light on nothing no sensors are bad so I don't know what it could be

My friends went out on his vehicle no codes or check engine light came on but it was doing just like your vehicle shutting off every time he came to a stop. Not saying that is your problem but you should get it checked out. Now on some vehicles you can change it on the side of the transmission but I think you will have to remove transmission pan to change yours.

OMG I don't have mechanic and I'm due in 3 days was really hoping it was something I could fix myself

Sorry to give you bad news that may not be the problem but it is just one thing that could be the problem maybe someone else on this forum can give you some other reasons as well.