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Popping Sound

Engine

Vehicle Information: Model: Carrera; Year: 1986; Body Type: Targa; Engine (type, size, modifications): 3.2 L; Total Mileage: 90000;

I have had a "popping" sound during deceleration in all gears. The mechanic I used diagnosed as holes in the heat exchangers and they were replaced. Popping is still there. It really doesn't sound like a "backfire" to me.Could this be muffler/catalytic converter issue and/or something else.Thank you.

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