Water or oil may enter into the ignition coil cover and the spark plug bore, causing a misfire and illuminating the Check Engine Light. A coil with improved water and oil sealing is available and should be installed.
Problems for specific Ford Thunderbird years:
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Newest reported 2004 Ford Thunderbird problems
There may be an extended warranty on the ignition coils - see your Ford Dealer for more information-Thanks John B for this information!