Mystery noise!

Pr2005z4

Member
2005 z4 2.5 125000 miles. Noise isn’t that loud, more like a vibration (?) that last a few seconds then goes away. Occurs when rpm’s are low and slowly accelerating. Thought it might be wind shield or cat shield loose but…. Shop checked and isn’t that. While my car was there, the noise stopped (of course it did). So no fix, no charge. When I drive it home it was gone but back next day. Ideas? Anyone? Anyone?
 
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