Could you be hearing the clicking of the fuel injector?
Did you also check the other end of the wire? Into the coil pack?
You can spray soem water on it and look at it like ferratiillis suggested.
__________________
BroncoJoe19
2006 Alt Fuel Jeep (electric)
'98 windstar 3.8L
'99 Crown Vic 4.6L
'90 Full Size Bronco 5.0L
I'm not a professional mechanic, take my suggestions with a grain of salt, or a cup of coffee 
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