The 4.8L, 5.3L, and 6.0L V8 engines in the Chevrolet Silverado, Tahoe, Suburban, and GMC Sierra use individual coil-on-plug ignition coils for each cylinder. Unlike spark plugs, which wear gradually, ignition coils tend to fail more abruptly — and when they do, the symptoms can mimic other engine problems, making diagnosis tricky if you don't know what to look for.
1. Check Engine Light with Misfire Codes
Diagnostic codes like P0300 through P0308 point directly to cylinder misfires, which are commonly caused by a failing ignition coil rather than the spark plug itself.
2. Rough Idle or Engine Shaking
A weak or dead coil means one cylinder isn't firing properly, causing a noticeable shake or vibration, especially at idle.
3. Loss of Power or Hesitation
If your truck feels like it's missing power under acceleration or towing, a failing coil reducing spark strength to one or more cylinders is a likely cause.
4. Reduced Fuel Economy
Incomplete combustion from a weak coil forces your engine to burn more fuel to compensate, showing up as a drop in MPG over time.
5. Intermittent Symptoms That Worsen With Heat
Ignition coils often fail intermittently at first, especially after the engine has warmed up — a classic sign that's easy to dismiss until the coil fails completely.
Why Replace All 8 at Once
Coils on these V8 engines tend to age together, even if only one has failed. Replacing all 8 as a set — rather than one at a time — prevents repeat trips to the shop and ensures even performance across all cylinders.
Why Genuine ACDelco Matters
The ACDelco D585 uses pure copper windings and corrosion-protected laminations that match GM's original specifications exactly, offering better resistance to internal shorts and dielectric breakdown than many aftermarket coils.
👉 Shop the Genuine ACDelco D585 Ignition Coil (8-Pack) — pairs perfectly with our ACDelco 41-962 Spark Plugs for a complete ignition refresh. Free worldwide shipping, and a free step-by-step install video included with every order.