Great plugs for my 03 Silverado with 4.3 Vortec V6. I used to fit AC Delco double platinum spark plugs but they were missing which caused the engine to run rough at less than 1,000 miles with spark plugs on. Immediately after switching to NGK, the engine ran smoother and was much more responsive in all RPM ranges and completely stopped misfiring. My friend said he had never seen a 4.3 V6 engine idle so smoothly.
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