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1973 911E MFI Backfiring

Engine

Vehicle Information: Model: 911E; Year: 1973; Body Type: Targa; Engine (type, size, modifications): 2.4 MFI; Total Mileage: Around 40,000 on motor ;

There are 2 questions that I have. This is the first Porsche that I haveowned or driven.1. I experience backfiring from time to time. This usually occurs when Iam decelerating. I did see what appeared to be a relief flap on the MFIhousing unit, but was unsure whether I should getsomething repaired.2. I am probably just paranoid about this as I am used to a relativelyquiet car, but should I hear the lifters in the car? The pecking isconsistent and the car runs beautifully, but I just need toknow if I should expect this noise.

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