Loud thrumming sound coincides with speed and braking, no lights or warnings on dash, no codes with reader

A winding sound when I turn the ignition

Random multiple misfire at idle. Runs fine under load, just misfires at idle. I have changed intake gaskets, plenum gaskets knock sensor plugs wires cap and rotor and just can't seem to figure it out. The wife took it to a shop and they told her literally everything I did needs to be changed. I'm a pretty mechanically inclined person but this one has me stumped

This issue has happened a couple of times. When playing the radio, the rear speakers suddenly stop producing sound. It will remain this way until I shut off the vehicle. Come back out the next morning, and the speakers work fine. Won’t happen for months. Then it does the same thing. I suspect it is the head unit, but I haven’t had time to check anything yet. Rockford Fosgate system.