MY CAR SEEMS TO CHOKE A LITTLE AROUND 80MPH. on 2000 BMW 740i

WHAT CAUSES THE BMW 740I 2000 RPM GAUGE TO DROP A LITTLE WHILE DRIVING? MY CAR SEEMS TO CHOKE JUST A LITTLE AROUND 60-80 MPH, BUT THERE ARE NO WARNING INDICATOR LIGHTS ON. I HAVE CHANGED SPARK PLUGS AND FUEL FILTER ALREADY.

Asked by for the 2000 BMW 740i
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