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HI Winders,
I believe what you are calling "intake air pressure" is the same thing I am calling a MAP (manifold absolute pressure) sensor. Without a map sensor you have no altitude compensation your system will run rich at altitude as there is no way to tell the system there is less air entering the engine. May not be a problem were you live. I live in Denver and can go from 5000' to 14,0000' in less then a hour. FYI at 5000' there is approximately 20% less air, so our normally asperated cars make 20% less HP, so sad. Running rich is not usually a big problem. If you tuned your car in Denver and went to a lower altitude you would run lean, that is a problem.
john
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