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When you test drove the car, what was the level of the fuel tank? I'm assuming it was full, correct? I think there's an issue with the in-tank fuel pump, pickup or sending unit. Something there is starving for fuel when at an incline. Try filling up the tank and testing it again and see if the problem goes away. If it does, then the problem is in the tank.
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Gabe
'13 335i M-Sport
Past - '06 330xi, '07 X3 3.0si, '09 328i, '12 X3 XDrive 35i
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