The dual-fuel 1995 Holden VS Commodore I recently bought is a cracker and cheap to run, but it has started to backfire even when idling. Is this normal for a dual-fuel car?
Let's put it this way, it's not unusual, it's a sign it needs a service. Go through the ignition system and make sure all is well, perhaps replace the spark plug leads to make sure there aren't any random sparks that could ignite the air/LPG mixture in the intake manifold.
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