So sometimes when I accelerate from a stop sign or stop light, nothing crazy just normal on the skinny pedal it feels like the truck is hesitant or missing. I've noticed when it does this black smoke comes out, not a lot though. It only does it in first gear and never while at cruising speeds. The truck is mostly stock to my knowledge. When I bought it it already had a CAI and exhaust put on it, don't know if it was ever chipped or still is. It doesn't drive like it is anyway. You guys ever expeirenced this or know what it is?