Ok so we just moved from los Angeles to south east Idaho which is about 6000 ft above sea level. I have a 1989 Chevy c3500 with a 350 out of a caprice. It has 2 fuel injectors, each one fires 4 cylinders. I remember it was running a little rich before I left LA but now I can smell straight gas coming out of the exhaust. Is there an adjustment that I need to make for the altitude change? What else could be the problem?