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Q: My car has a duel fuel system and it sometimes runs rough

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my bf falcon is duel fuel after maket gas injection kit was in staled in 2010 has recently been playing up it starts on fuel warms up then automacticly flicks to gas runs fine but on a long trip every now and then it will light up as if its running petrol as well as gas at the same time when this happens lose power car runs rough what would be causing this ?

My car has 348654 miles.
My car has an automatic transmission.

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