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We re-seated all the COP connections and it's running smoothly again. Maybe GM did a better job with the COPs and they'll last a while. Anyway, I think we finally have resolution. Thanks for the help, guys.

As an update, I ordered the coils (ACDelco) as I could no longer find the Visteons for whatever reason, and while they were shipping, the car was driven one more time, at which point it died entirely. One of the timing chains snapped. The stupid plastic adjusters shredded to pieces filling up...

Well it seems to be unanimous so I suppose I can't argue with the Lincoln guys. Are the Visteon coils advisable? The replacement I put in was a United Ignition Wire coil from rock auto. Maybe I can return it and get the full Visteon 8 set if that's what's recommended. My brother in law just...

Wouldn't a (or several) bad coil(s) cause a miss at any and all RPMs though, if not especially in hard acceleration? This thing runs buttery smooth above 1200 or so RPM and seems to have all of it's original power at WOT.

The plugs are about 10k old and are 100k platinum plugs. I cleared the code after swapping the plugs and coils from cylinder 4 and cylinder 1 and the code came back misfire cylinder #4, so it is not following either the plug or the coil. I appreciate the response, and no offense, but if...

Let me first apologize for posting about a common subject but searching has not yielded any results for me. My brother in law's 2001 Lincoln LS with the 3.9L V8 has a very rough idle. It started as a light occasional miss at idle and has progressed to what feels like a misfire. Above 1100 or...