Super Basic question..... Do you know if the ECU was tuned after adding the RIPP Supercharger? I have seen it happen many times where people slap on Power Adders like Turbo's and Superchargers and think that the stock ECU Tuning will magically retune itself to figure it out. That doesn't work. Your comment of "Having an issue allegedly due to elevation" sounds like the ECU wasn't tuned or was tuned but done by a monkey.