luckett3201

2008 Ford F-150 random missfire it has the 4.6 I'm getting a random missfire can't figure out what cylinder I'm scanning it with a snap on ethos all is says is random missfire on the data part it says all cylinders passed I have put new motorcraft plugs and new coils
the egr valve and tube is rusty is there something I might be missing to check thanks

luckett3201

I just scanned it with a different scanner and came up with p0106

Cwprotek

MAP sensor. You have the 4.6 right?

luckett3201

Yes it's the 4.6 will that cause the random missfires thanks

Cwprotek

Sure can..

redfishtd

There are tests for that to see if sensor changing with pressure , You could also use a vacuum gauge among other things . map in your case is changing fuel mixture .