What would cause my head lights to flicker and also the interior dash lights to? on 1999 Chevrolet Monte Carlo

Doesn't flicker all the time only sometimes

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2 answers
Does this happen when you push on the brakes? I had a similar problem when i pushed on my brakes and I just unplugged the ABS and it stopped.
POSS BAD GRD CONNECTION OR PWR LOSS AT TIMES