Plugs were changed around 30,000 miles or so ago. I changed them with the lifetime BOSCH type from Autozone. I see from this site that many recommend changing them with Motorcraft parts. I suspect if I have to change any of the ignition coils (COP's) then I will change the plugs back to Motorcraft at the same time.

I see that you can get a full set of COP's on Ebay with a lifetime warranty for $75 plus $11 in shipping. For this price, I suspect I should just change the whole lot. My personal issue is that, as an engineer, I really want to understand the what and why of the failures vs just changing parts to see if the problem goes away.

The location of these are at: http://cgi.ebay.com/ebaymotors/NEW-I...em180223319317

Would love to hear someone confirm these are good parts to use.

Thanks, Brett

Brett