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Q: Why is it missing? on 2002 Ford Taurus

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Missing on cyl.4&5, code P1633. New plugs and wires. Coil is good.
(1) Answer
possible fouled spark plug threading. even pin hole can cause issue.
possible fouled injectors. run diagnostic to find out for sure.