tonight at the deer lease i had ran my truck for 2-3 hours just about idle to maybe 1500 rpm. when i went to close gate i had notice my exhaust smelt more rich than ever. looked at the tail pipe and it was pouring smoke. drove down the road and even more smoke. did not go away till after 10 miles of driving at highway speeds. i had just install h&s tune on my truck and it is on tow setting. any ideas? i still have the dpf and egr on truck.