I have a 2004 ram 2500 5.7l hemi. I’m looking at programming it, because it is not running properly. I believe it had a program installed when I bought it that I didn’t know about and I tried to install my super hip obi tuner and it gave me an error, program already installed and couldn’t delete it or overwrite it. Ever since it has idled a little rough, replaced plugs and wires. And now it runs really fuel rich and blows a lot of black debris from the exhaust every initial start up

What is the chance that the truck won’t run if I have the dealer flash it back to stock? I believe things have been dummies and changed for the previous program