The 4.8L, 5.3L, and 6.0L V8 engines in the Chevrolet Silverado, Tahoe, Suburban, and GMC Sierra rely on precisely calibrated fuel injectors to deliver the exact amount of fuel each cylinder needs. Over time, injectors can clog with deposits, wear out, or begin to leak — and because the symptoms build gradually, many owners don't realize how much performance they've lost until after a replacement.
1. Rough Idle or Engine Shaking
A clogged or malfunctioning injector delivers inconsistent fuel to its cylinder, causing a noticeable shake or rough idle, especially when the engine is cold.
2. Reduced Fuel Economy
Injectors that aren't spraying a clean, atomized mist force your engine to compensate, burning more fuel for the same performance and gradually dropping your MPG.
3. Hesitation or Loss of Power
If your truck hesitates under acceleration or struggles when towing, uneven fuel delivery across cylinders is a common culprit.
4. Check Engine Light with Misfire or Fuel Trim Codes
Codes like P0171, P0174, or P0300-series misfire codes often point to injector problems, especially when multiple cylinders are affected.
5. Fuel Smell or Visible Leaks
A failing injector can leak fuel externally or drip into the cylinder when the engine is off, sometimes causing a noticeable fuel smell or hard starting after the truck sits.
Why Genuine ACDelco Matters Here
Fuel injectors require precise, flow-matched calibration to work correctly across all 8 cylinders. Counterfeit injectors sold under legitimate part numbers have been reported to stick open, leak, or fail to seat properly in the connector — problems that can flood a cylinder with fuel and damage spark plugs in the process. Genuine ACDelco 25317628 injectors are built and tested to GM's exact specification, avoiding these risks.
Replace as a Full Set
Because injectors wear together and flow-matching matters for smooth combustion across all cylinders, replacing all 8 at once — rather than one at a time — gives the most reliable and balanced result.
👉 Shop the Genuine ACDelco 25317628 Fuel Injector (8-Pack) — free worldwide shipping, and a free step-by-step install video included with every order.