1989 760 turbo Engine Trouble.
When I accelerate to when my turbo boost gauge goes into the boost area the engine seems to lose power instead of increasing in power, I have to actually let up off the accelerator in order to regain the power. I also have a problem in which the engine starts to run badly as if the timing is off or like a vacuum line is malfunctioning and this only occurs when the car has been running for a while at normal engine operating temperature. Does anyone know what might be causing this in my 1989 760 Turbo.