i have the napa sparkplug wires so i believe nothing special as far as dual ground.
coolant stays steady no flux.
firin order is matched and nothing has been swapped as i got the misfire 2 stop for a period of time and returned
havent done a compression test have no knock or coolant/oil variance
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96 Runner 3.4L 5-Speed 4x4 (no mods yet)