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SOURCE: Spark plug gap on a 1992 Gmc Sonoma 4.3L V6 FI
Usually somewhere on the engine or in the engine compartment, there is a sticker with the engine specifications. The spark plug gap should be included. If not .032 or an inch should be close.
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SOURCE: SPARK PLUG GAP
go to autozone.com
click on repair guide, then on specs, it tells you the gap in the specs.
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The gap for spark plugs for 1990 GMC is .35
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