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Q: idle surges on 1990 BMW 325i

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my bmw sounds like it is surging when idling, seems to get worse when it warms up. this happens from about 700 to 1400 rpms. my mechanic can't figure this one out. thank.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Its the Air Flow Meter. Its a black box the size of a deck of cards on the intake side of the throttle body. This is glued down but you can gently pry it off one side at a time. My 1990 325I worked fine until I removed the power side for inspection. I did not reinstall it properly and the vehicle now surges up and down like yours. I plan on reinstalling it properly soon. It could be the cable to the unit. It surges when unplugged. Google Bosch 0280202082
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