Replacement of spark plugs

Hello, spark plugs and backfiring don't really line up as related. Backfiring, if that's what is happening, is usually caused by vacuum leaks, air intake leaks, exhaust leaks or emissions control concerns. An engine timing issue could cause a backfire. Have the vehicle inspected by a shop near you to check it out. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops