I have an old 2000 Ford Taurus that has been having some misfire issues. I replaced the wires and plugs about a year ago and hooray! it worked… until about a month ago when the check engine light came one. Misfire in cylinders 1 and 3… again. I ran some SeaFoam through and it did okay until this week, when the warning/flashing check engine light came back.
EDIT: Forgot to mention that it is idling very hard (expected) and feels like it is trying to stall, even before the misfire came back (also to be expected??).
So here is the question: is this a coil pack issue, or something more sinister (and expensive)?