Car make a bang when I turn on

[laura79]

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So a

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no

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ther problem for my 85 spider..Sometime,when I turn on, I heard a bang from motor bay...then car turn off...I turn key and it starts fine...only one time,when I turn on after bang, car wouldn't stay on..after. few time it starts fine..spark plugs are good and I mounted their 5000miles ago..thank you