I'm pulling my hair out with this one. This is in a 2004 TCM H20 FG25T6. I changed the plugs (gapped at.027) I've set the timing at 9 BTDC (also tried 4 BTDC, 6 BTDC, and 8 BTDC). The manual says timing should be set at 4BTDC, but that is for Gasoline. I've been through the fuel system, cleaned the throttle body, CA55 carb., and intake. I replaced the VVF30 Fuel Lock with a new one and replaced the regulator with a new Cobra. The cap and rotor look good, as do all the vacuum lines. I've been using an old Health Kit exhaust analyzer that is calibrated and balanced. Either way, it stinks and is clearly running super rich. I could get it to run well under load and at elevated RPMs between 2% and 3% CO, but at idle it would spike to over 8% CO. I am adjusting the main butterfly and the idle mixture screw. The idle mixture screw will thread out before getting CO below 8%. I've spent two and a half days struggling with this. Please help.