They shouldn't flicker. Unfortunately cheap, poorly made LED's do flicker. My experience with led's is buy quality brands like Phillips, Samsung, Cree etc.
You can try applying voltage to the lights off the car and see if it cures the flickering by connecting directly to a battery. Doing that ensures a good steady voltage supply.
Leds need a clean and constant power supply to work well. The powerful uk pcb solution are more than just resistors. They also use capacitors and voltage regulators to deliver clean and steady voltage.
Good luck sorting it. 2007 Vogue TDV8 in Zermatt Silver with Charcoal
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