I am having an issues with my 2018 GMC 2500 with around 126,000 miles where if my truck sits for at least an hour I get a high pitched noise around 35mph when modulating the accelerator. It’s been to two different shops and they say they can hear the noise but by the time they get it back to the lift it’s gone so they can’t tell what the issue is. It only happens for the first mile or so. Has anyone dealt with this before? I was able to get it on video here.