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I'm having the exact same problem with an 1989 Lesabre. It's done it every time I've driven in heavy rain since I've had some exhaust work done. It always goes away after about 30 seconds and has never happened when driving on dry roads. It sounds like it's coming from the front of the car. It happened yesterday while driving in heavy rain, I put the car in neutral and revved it a little. . . It definatly sounds like exhaust noise. If anyone has some advice please share . . .Thanks
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