I'm not sure if the noise I'm hearing is a VCM issue or not. It only happens when I have the cruise control on. When I go over a small hill and start down the other side it fells like the engine roars for a few seconds. The RPM's do not change, it's almost like it downshifts. Again, only lasts a few seconds but seems more constant now than before. I've had the truck for 3-1/2 years and this only started about three months ago. 2017 EX with about 52K.