lope at idle
So some times at idle my truck will start loping. i dont have a lope tune on my ts chip. I just have the canned tunes. any idea what could be causing this? it used to happen on cold starts. but in the parking lot at the ski mountain this past weekend it was 50 degrees and it started doing it as i was idling out of the lot. If i hit the brakes and give it a little gas it will stop. just wondering if there is anything wrong with it. happens in stock to 140. heavier in 140 though.