Flickering lights

Hello all my name is: Chris
I have a: (GTO, 1998, 3000GT, SOHC; My lights are flickering all over, especially when I’m driving. I’ve checked all grounds and cleaned up the surfaces where they go. New alternator and battery. Still lights flickering. Any suggestions?

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Does it pulsate when you are at higher revs and are lights stable on tick over?