1999 Ford Expedition Start Epxo Makes Loud Metallic Popping Noises Andwhen Push

1999 FORD EXPEDITION
18,300 MILES
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When i start my epxo it makes loud metallic popping noises andwhen I push on the gas pedal it sounds like popcorn popping. Whats wrong with it?
Apr 7, 2013 at 2:43 PM
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