New truck problems

Mine was doing that on my N 14. Replaced the starter and now it cranks fast and starts right up.

 

Look at oil, see if it is a weird color. Are you having to add coolant? That hard start kinda sounds like you have coolant leaking into a cylinder and trying to hydro lock. That smoke you mentioned is the coolant burning off. Since you just had an inframe done I bet you have a headgasket failing from improper liner height or a bad head. Cat heads have been having issues with the reman and castings. Another thing it might be is a starter getting weak. Hope for the later but I betting not.if it is coolant get it fixed pronto. You can bend a rod trying to start it with coolant sitting on a piston.

 

Starter

 

The answer lies in the smoke

 

Starter won't make the engine smoke and studder.

 

Guys I think the second question of his is that the engine is in cold mode. Correct me if I'm wrong, but my acert will smoke and stumble if I don't let it get warmed up properly once I hit the road in the morning. It won't do it all the time but sometimes it will even cut my turbo boost in half till warmed up too. Once up to operating temp it runs great.

Did you check and clean all the connections? Is it possible whoever did overhaul didn't get something hooked up right or is loose?

 

Take the gueswork out off this story and take oilsample.
Have it analysed.
Simple.

 

Talking about the rough starting part of his problem Einstein...