alan530i

My 94 bmw 530i was running great, then went from 60mph to 20mph. It idols fine but when you push on the gas pedal it bogs down. I put a mass air sensor in, did not help. Any one have an idea. Thank you

Done1

I'm going to guess maybe vanos solenoid or fuel pump(filter)also possibly because it's drive by wire I believe could be air valve servo not opening hope that might jog a solution other than that I'm stumped too.

alan530i

Thank for the info. I just replaced the fuel filters, did not help. What did help was unpluging the mas air sensor, runs bad, but I can go 55mph.