Service Engine Soon Light Blinking/Missfire
I have a 2001 F-150 5.4L 60,000 miles. Three days ago I changed all the plugs(Motorcraft Platnium) & fuel filter. Today while I was driving it started missfireing/studdering bad. Mostly under a load or when I accelerate. I got home, pulled all 8 coils off & re-seated them, test drove it & it ran perfect! About 3 hrs later went somewhere & it came back, after about 30 min. of driving...this time the service engine soon light was blinking & it run terrible, except when I stomp it. I pulled the PCV Valve out & it was making a loud chattering sound...when I put my finger over the hole it did suck though..is this chattering sound normal? Also, which type of scanner do I need?