Welcome to the Forum!
Ya I agree its probably injectors. When you say barely moves is it like the trans is slipping or the motor is sluggish?
The injectors are know to go in these. Usually the injector leaks causing the smoke. Check the oil for diesel fuel (Usually thin and over full). If you have a older scanner it might not ommunicate with the comp. Heres the electric specs of the injectors. You can check them individually with a multi meter to see which one is bad.
Im in the same boat as you. My dad owns a auto repair buisness and neither he or I know alot about diesels. Iwent to a class on the dmax motor and electronics. Heres a page from the book with the specs.
