re: Diesel Engine MPG question... i know im going to catch hell for this

My main issue right now is that my main mechanic did some work on it last week with the aftermarket stuff in there, as he has in the past. What he did and what I have on there shouldn't have coincided with each other. Well now that I get it back, it's in limp mode and not wanting to run right. I've used him for years an not saying he did anything wrong but I'm kinda stuck and it couldn't have happened at a worse time.