The 4.8L and 5.3L V8 engines powering the Chevrolet Silverado, Tahoe, Suburban, and GMC Sierra are known for durability, but even the most reliable engine depends on healthy spark plugs to run at its best. Over tens of thousands of miles, electrode wear and carbon buildup gradually degrade ignition quality — often before the check engine light comes on.
1. Rough Idle or Engine Shaking
Worn spark plugs struggle to maintain a consistent spark, which can cause a noticeable shake or rough idle, especially when the engine is cold.
2. Hesitation or Sluggish Acceleration
If your truck feels like it's lagging under acceleration or struggling uphill, inconsistent ignition from worn plugs is a common cause.
3. Reduced Fuel Economy
A weakening spark forces your engine to work harder to burn fuel completely, which shows up as a gradual drop in miles per gallon.
4. Difficulty Starting
Worn electrodes require more voltage to fire, making cold starts slower or less reliable over time.
5. Why Genuine ACDelco Matters
The ACDelco 41-962's double platinum point pads on both the center and ground electrode are engineered specifically for GM's ignition system, offering more consistent voltage demands than generic aftermarket plugs — which translates to smoother running and less wear on your coils and ignition components over the plug's lifespan.
Replacement Interval
Most GM V8 engines call for spark plug replacement every 60,000-100,000 miles depending on model year — check your owner's manual for your specific interval, and always replace all plugs in the set together for even performance across cylinders.
👉 Shop the Genuine ACDelco 41-962 Double Platinum Spark Plugs (8-Pack) — free worldwide shipping, and a free step-by-step install video included with every order.