[Dave at Pelican Parts]

The MPS controls the mixture under all conditions. The idle mixture knob has some influence, but the MPS has more. The idle knob is removed from the equation when the throttle switch is not closed--when the throttle is open, or when the TPS is unplugged.

The MPS can, in some cases, need adjustment. JJ Slowik's old 2.0 had some relatively-minor problems after he got everything else sorted out. His mechanic tweaked his brand-new MPS, and it ran just fine after that. Note that this is a professional mechanic with LOTS of tools (including an exhaust gas analyzer) and LOTS of experience. And this was in Denver, which is 5000+ feet above sea level.

I dunno about you, but I am not in Denver, nor do I have an exhaust gas analyzer, nor do I have that much experience. I'm going to leave my MPS alone.

--DD