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Engine Misfiring

Engine

Vehicle Information: Year: 1987; Engine (Size, Modifications): 930S; Total Mileage: 33104;

I read a few posts regarding misfiring or backfiring in the 930 engine. I've noticed this in my 1987 930 while deccelarating from ANY gear. It literally sounds like popcorn popping in the microwave. Some posts suggested that this is "normal" with the older 930s. My car is all stock. Should I bring it to a mechanic or did the car run like this off the production line? Thanks in advance.

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