loud bang! in the exhaust system?

[hippiehawk]

86 bronco II. I changed the valve cover gaskets, sparkplugs, air, oil and fuel filter. Now there is a freqent bang noise that seems to be in the exhaust system. The car was not doing this prior to my repairs.

[J-Roc]

Is it backfiring? You changed the plugs? Make sure you got the right plug wire on the right plug. Double check you got the correct firing order.