Just removed my dpf, and tuned the truck. Stock tune just dpf and egr removed. Now at cruising speeds under lighttle I get a funny sputter, surge, lag. Press the pedal to the floor and 5 seconds later it comes to life like nothing it's wrong. I read somewhere that I should have left my pressure switch on the frame rail and plugged in? And should I be unplugging the egr solenoid? Would that cause the rough running? Help me out here gurus