Mine did that just awhile ago, and my culprit was the heat shield over the cat. As mentioned above, just one of the welds had broke loose. I took it to a muffler shop and the guy zapped it back on real quick. Better than the quick and easy fix, he didn't accept payment for such a simple job! Gotta love that.
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89 LX 5.0 Notchback, near showroom condition, Flowmasters (my dream since 16)
98 Grand Cherokee 5.9 (Very rare and hence a driveway princess), 90 VW Jetta Diesel (200K, 45 MPG and all hers), 87 Cutlass (mine) 84 Cutlass (170K of faithful service)87 Bayliner 2250 Cuddy
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