Re: backfire?
I have seen that happen in a number of cars over the years.
Not every time they were shut off but offen enough that you notice.
If the car is otherwise running good, I would not be overly concerned. Could be carbon buildup. Also check your timing. If you shut off engine with the spark fully retarted, does it still back fire? If not, than timing has something to do with it.
You will normally hear a leaking manifold.
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