So my Ford Ranger 2.3L 2011 with 170k miles was very rough starting and had a shaky engine. I administor oil changes ans other maintenance regularly. Someone recommended that I change the starter/ solenoid . Replaced it with a new starter/ solenoid. And truck would not start from there. So after that, I replaced the ignition coil thinking that could be the issue. Still will not start but can hear faint humming noise from underneath now. Wondering where I should go from here and or if there is any advice anyone out there can give me in my situation.