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Volvo penter 5.7gsi backfiring

Rick931

New member
Hi I wonder if anyone can help me I am new to boats and have an issue with my Volvo penter engine it backfires at around 1800 rpm but only when the engine is under load I've put new plugs,leads and coil on and changed the fuel filter but still back to square one could it be the electric points unit or map sensor if anyone could shed some light on this it would be great
 
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