Car vibrates at idle more than it should. The higher my amperage output goes the more it vibrates. I was reading ELD (or EDL?) output on my dads x431 and at idle in park it shows a steady output of 8.8A. If I activate other power switches such as lights, power windows, ac blower, etc. the engine will vibrate more as the output value rises. My alternator says its usually around 60% output at idle and can rise up to the 80-90% range when electrical loads are applied. The factor I keep in mind is that my engine does have 300k+ miles so I know the inevitable wearing can highly contribute to the vibrations at idle. Let me know what yall think I can do to help reduce the vibration