My license was up for renewal and it requires an emissions test this year. It did great in the Hydrocarbons area 222 vs 500 revved and 379 vs 1800 idle. However with the CO it barely passed 4.89% vs 5.00% revved, and failed 5.97% vs 5.50% at final idle. The ranger has less than 130 hours on it. Being fuel injected, there isn't any adjustments I can make. Has anyone had this problem or have ideas about how to fix it? Seems like it might be slightly lean.