Why is the 525i 01 making a jump noise in transmission when i reduce speed?

I have a honda accord i'm pretty sure its an 05 accord and it keeps making a jumping noise when i reduce speed and it feels as if something is hitting on my transmission. What could the problem be. My maf sensor is unplugged and i was wondering if maybe it would be that. But imjust not sure.

Which car you have the problem? The Honda Accord or the BMW 525i?

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