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In my experience across several cars fitted with MFI, the barometric cell has a pretty limited range of compensation. I have yet to see one that can compensate for a 5,300 foot change in elevation. Oh, the car will run across that variation in altitude, but not optimally. It's best to readjust the pump, especially if we have moved from a high altitude home to a sea level home, or vis versa.
We do that by adjusting the main rack, not the idle mix adjustment. I probably wouldn't even bother with the latter, it gets completely overwhelmed by the main rack adjustment.
The main rack adjustment is behind the allen bolt to the lower right of the warm up solenoid. It is best accessed with the speciality tools available for this, the long t-handle allen wrench and the long, very fine tip flat blade screwdriver. Snake them in under the coil, to the left of the fan shroud.
The warmup solenoid is unaffected by changes in altitude. Don't even bother looking at that.
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