Well this one has me stumped, I have a '03 X 6.0 and when ever it feels the urge to it will surge just a idle. This only occures after it's warmed up and it may do this all day long or it won't do it for days
. No codes or service engine light, hooked it to the scanner and ran all the tests and all ok.
It's been doing this for months and it doesn't seem to hurt anything but it drives me nuts
because I know it's not right. Any suggestions