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did you properly "gap" the spark plugs? many spark plugs have to have the ends properly "gapped" before installation, by using a "gapping" tool/wheel to properly space the arc gap to the correct distance.
if the plugs were properly gapped, or already came pre-gapped out of the box for your specific vehicle, then you may have air getting into the cylinders around the spark plugs. were you careful to properly tighten the spark plugs straightly into place, or is there a chance that you left one loose, or, even worse, cross-threaded one of the spark plugs?
it should be .054 however You should always use the sticker under the hood
of your vehicle. If for some reason your says .052-.056, then that is
what you use. The stickers on the truck will have the most specific
info for that truck of anything. I need the year to be more sure, also when you buy the plugs, the parts store can tell you the exact gap.