When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I just changed the plugs in my 2001 SC 5.4. That was fun!! But it seems that my milegae has gotten worse??? An6y ideas on what may have happen...I installed Autolite APP103's.
The general consensus is to use OEM motorcraft plugs only. Lots of people have had problems with their engines not running properly with other brand plugs.