97 Cougar 4.6 V-8 question
See what you think.I replaced the wires and plugs in maybe November 2011 cause it was missing (skipping).Put several miles on it since with no running problems.Yesterday i drove to my brothers house aprox 14 miles away,it ran great.Hung out there for around 4 hrs.Left and it was missing.Up on the highway with rpm's around 1700 at 55 or so on "flat" surface no miss,under load miss.Almost was home,and off the highway.Now from thehighway to my house it's all hills & under extreme load.Ran great.What the hec?????? I know it didn't just fix itself!! Thanks folks.