Hi guys - I could use some help from someone better caffeinated that I am on figuring out what is going on here. I took the 1980 ZS stock TR8 to my CA SMOG test, it failed CO levels narrowly. No problem, so I thought, I ordered up the ZS mixture tool from Moss, and 1/4 turn counter-clock wise to lean out the mixture and solved. Went and re-ran the test and the CO levels were far higher, almost 50% higher. Huh? How did that happen?