My truck was sitting all weekend and the temps been in the mid teens and i started it up tonight and the smoke was so thick i couldn't see my neighbors house. it revved to about 1200 and stumbled pretty bad. I'm getting the 18-037-004 flash done this week is that gonna take care of it and is that about how much smoke others have seen? Also it has a sound like an exhaust leak but it comes and goes only when at idle and cold outside any ideas? Thanks