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Maybe old gas, when it goes bad, i don't know what happens to it but it's perfectly possible that it looses octane value hence preignition firing. How old is the gas, i think more than 4 months is considered bad (from my old dirt bike racing days). For your next rebuild/car storage, i think there's a solution you can buy that stabalizes the fuel for six months storage, you can get it at a motorcycle shop or small engine dealer.
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2007 Mazda 3 hatch
1972 Porsche 914 roller with plenty of holes to fix 
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