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My guess is green wire problem. Backfire suggests unburnt fuel in the exhaust which will happen on ignition failure. Green wire can short to outer sheath.
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1959 Bristol 406 (bought in 1972; sold in 1977)
1966 Porsche 2.0 coupe (bought in 1977; sold 1981)
1978 Porsche SC coupe (bought in 1993)
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