Nissan Repair Questions? Ask a Mechanic for Answers ASAP
If its backfiring in the intake then the timing is out or you have an open exhaust valve .
But sounds most likely to be the timing .
Check the timing belt could be out a tooth or so .
Is the check engine light ON when the engine is running .
Check for malfunction codes .
But most common on this engine is a lose timing belt .
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