My 2007 expedition 5.4 runs perfect but I hear a loud rattling noise at speed under load. Let off gas no noise ease on gas NOISE. No garage can seem to figure this issue out ???
@Beamer67 Where do you think the rattle is coming from? Engine? Drivetrain? Exhaust? Maybe a mic setup would help you find the source. 3.5mm to your smartphone jack. Use a recording app. This one has a 59" cord. Apple or Android. https://www.amazon.com/dp/B074KJ1N3D/ref=psdc_8882491011_t2_B00VYGVZYO
Shame you sent to "professionals" an they gave it it back with no determination of possible cause. The sound's source isolation with a mic is where I would have started had it been turned into me for diagnosis if I couldn't determine the cause of the rattle.