At first I thought it was the brake dust shield rubbing so I took all 4 wheels off and tested. Not it. While I had the car up on stands I released the brake, cranked the engine and put it in drive and still got nothing. Put everything back together and cranked engine and I could hear it again, but while carr was on the ground and in P. The sound is sort of a rubbing noise. It isn't continuous though. It doesn't sound like hard metal either, it sounds like a thin heat shield type metal....or something hollow. I'm wondering if its the exhaust. I know its not the wheels rubbing since I can hear it when the car is in P and I tap the gas a little. Any thoughts?

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1990 190E 3.0L