Normaly when you are breaking in a motor after a few tanks they will not want to idle due to the motor is not as tight and it can not use all the fuel and oil and it will start to load up on you. You need to get it running and warm it up by driving it and tune you HSN first to get you close so the truck is not spitting too much fuel and oil. Then work on your LSN. Then you can go back to your HSN and finish up tuning. If your motor is set to the factory break in settings it will not want to sit and idle too long with out stalling.