I've got an 87 corvette automatic with 146k miles. Last night A friend of mine wanted to drive it and I said ok. I noticed a jingling noise when he drove away similar to a chain being drug across the ground. When he got back I got in it to see if I could hear it. With the doors shut I couldn't hear anything so I opened the drivers door and revved the engine a little. I couldnt recreate the noise with the car in park like I heard for several seconds as he drove away. I could however hear it when I mashed the gas for about a quarter of a second. I couldnt pin point where it was coming from. It almost sounded like more of a vibration than a loose part clanking around. I thought it was suspension related but crossed that out when I heard it while the car was in park. My best guess is some wierd resonance from the exhaust making something rattle. Anybody got an idea?