Boost drops off when pulling hills.
I have a 2010 isx. When I start pulling a hill at 1500 rpm the boost is at 32-36psi. As my rpm drops I shift at 1200 and after shifting down two full gears my boost is at 20 psi and will not go any higher. Any idea why? I'm thinking air to air leak or egr is stuck open?
Is this a good question?