A leaky fuel injector can also cause backfire.   If the backfire is from the air intake (air cleaner), then that tells us that a very lean air/fuel ratio condition exists. The mixture explodes in the intake manifold instead of in the combustion chamber.
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The new number 1-800-VERIZON (1-800-837-4966) can be used by all wireline telephone, high-speed Internet and FiOS Internet and TV customers (though not wireless) looking to contact the telco for support.-800-VERIZON (1-800-837-4966). by Karl Bode. Tuesday Feb 03 2009 14:17 EDT. Verizon tells us that the telco has been streamlining their phone support numbers, and in the process reducing some one hundred different toll free numbers that were used in the past.