hi , I've tested the fuel rail pressure at sea level and at altitude where I live , over the 100 kpa measured on the MAP the rail pressure stay at 330 bar at warm engine , down the 100 kpa at 85 kpa , the ambient pressure where I live the rail pressure is set at 290 BAR and the engine run poor and when I drive the car on this altitude I feel the kj don't go right , now i can do some test , example the balance test for the injector , but I don't know what can I expect and what i must read if is ok , and why the pressure go down to 30 BAR when the atmospheric pressure is little different

any thoughts ?

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ECU Tuner -EGR OFF -DPF OFF Swirl/Flap OFF, Lambda OFF , DTC OFF in many cars , not ONLY

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