From what I remember the mk3 had an altitude adjuster which compensated for altitude but unless your in malaise it shouldn't make that big of a difference. I could be wrong and also are you running a factory ecu or aftermarket.
Also if you can include any mods and what ur car specifics it would help out in giving you a better answer
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1987 7m-gte R-154, SS braided clutch line, full 3in exshaust,aluminum radiator,full throttle gen 2 whith GM 3 inch mass air flow,13lbs flywheel, and more to come
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