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popping noise
I developed a similar problem a while back, only popping on deceleration and only the drivers side exhaust . I was told to look for an exhaust leak at the header flange to the cylinder and also at the header to sidepipe gasket. It turned out I had a vacume leak at the intake manifold gasket right at #1 cylinder. The intake gasket distorted out of shape and caused the popping.
Good Luck
Tony
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