Wondering if anyone has had this problem. I hear a loud scratchy noise from my car when it's in Park and reving sorta high. When I put it in gear it isn't as loud. If I drive up near a wall and listen to the sound bounce back, I can hear the noise. Does anyone know what this may be? Is it my engine or tranny? I read a post on the FAQ about a pressure regulator..but It really isn't a buzzing sound. Any help would be great. Thanks all.

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1991 Formula 305TBI
3" Flowmasters
Hypertech Chip
3.42 Posi on the way