Burbling sound on 98 Firebird

My 98 Firebird (V6) has recently started making a soft 'burbling sound' which changes in line with the engine revs. When idling, it's a fairly soft noise, the pitch and speed rises as the engine revs. It sounds as if it's
coming from the right hand side of the car. Initially, the sound was intermittent, becoming more frequent until it's now always there. Any ideas what it could be?
Cheers Dan
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<a> wrote in message

Check for a ehaust pipe that has come lose. Especially the mid pipe between the converter and the muffler. You may just have a lose joint, or a rusted thru or broken pipe. Charles
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