I have a 89 325i vert, everything is good until I reach about 3800 rpm's then the engine has a power loss. I have checked the fuel pressure regulator, the full throttle switch and the mass air flow sensor, no luck so far, any ideas on what I should do next
computer input or computer failure if it is software/electrical.
Broken valve spring if it is mechanical.
Those would be my first 2 things to run down along with what has already been mentioned above.
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