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Discussion Starter #1
Except for an Apten chip my ‘97 4.6 is stock including original ignition cables with about 76K miles.
About one year ago I installed 12C plugs and I have not noticed any fouling or misfiring problems at all.
Have any of you 12C users had any problems?
 

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I've had my 12C plugs in for over a year and they lookmgreat so far.
Never had a miss-fire or any problems.
 
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