Can i get a 'lil Dodge help here?

04 Ram 1500 4x2. 54k miles. I have been hearing and feeling a buzzing sound coming from the engine bay right before i come to a dead stop. I feel it in pedal, steering wheel, and under seat. Sometimes it persists as i rest on the brake. But if i turn my wheel to the right or left, it stops, yet comes back when i return the wheel to straight ahead position. The noise and buzzing are louder and harder when a/c is on. Is this a brake thing? A/C thing? Something sapping battery power? O2 sensor? Idle control? Tune up needed? Fuel injectors dirty? I did have a crazy idling happening but it went away when i used fuel injector treatment in gas. Please help!!!!
 
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