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2014 Silverado 5.3 — misfire on cylinder 4 under load only. Already swapped the coil and plug with cylinder 6, miss stayed on 4. What next?
🔧 Master Tech · REAL HUMAN
Good diag so far — since the miss didn't follow the coil or plug, you're down to injector, valvetrain, or compression on #4. On these 5.3s with AFM, cylinder 4 is one of the deactivation cylinders, and a collapsed AFM lifter is the classic cause of exactly this. Before throwing an injector at it: do a relative-compression test, then swap injector 4↔6 the same way you did the coil. If the miss still stays on 4 with good injector pulse, you're looking at that lifter…
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Answers are professional guidance, not a substitute for hands-on diagnosis. For safety-critical work (brakes, fuel, steering), always confirm with a qualified shop.