Detroit 12.7 running rough after overhead done. Need some ideas.

I was having some mpg issues and what I thought could possibly be an injector sticking issue. I was due for an over head and had it done at the shop in the yard I operate out of. It was running fine when i took it out for test drive bobtailing. I then get a load and take off. A couple of hundred miles later and I notice that when coming off the freeway and going to an idle the idle starts running rough (it used to be smooth) and I also notice that my power has increased. The next day things start getting a little worse and same with the next. The idle problem is still here, sounds very rough at idle and putting out a lot of smoke. When I go down the road it shudders and makes a lot of smoke and strange noises when I apply the throttle hard. each day problem gets worse. I am not sure if I should just go to the freightliner dealer and have them redo the overhead or just say not sure whats happening, lets find out. This is an 02 frieghtliner, 12.7 detroit and not putting out engine codes.

 

Thanks man, I will have them check that out

 

3 injectors out, having all six changed, they are original to engine and it has over 1,115,000 miles on them. I had an in frame about 115,000 miles ago and never replaced them. I will double check that the adjustments are correct, Thanks.