Why is it missing? on 2002 Ford Taurus

Missing on cyl.4&5, code P1633. New plugs and wires. Coil is good.

by in Fairview, OK on March 23, 2013
1 answer
ANSWER by , March 23, 2013
possible fouled spark plug threading. even pin hole can cause issue. possible fouled injectors. run diagnostic to find out for sure.