Ignition Coil Pack UF303 and Iridium Spark Plugs 5019 - Engine

Our review of this ignition coil pack UF303 paired with iridium spark plugs 5019 finds it best for owners of specific mid-2000s Isuzu, Chevy, GMC and Hummer models who want a straightforward replacement to cure misfires and restore throttle response. The single biggest reason to buy is that the kit combines high-grade coils made with silicon steel and imported materials plus iridium electrode plugs, which together often bring rough-running engines back to smooth operation without complicated installation.

Key Features

• Model compatibility: Fits 2007-2008 Isuzu i-370, 2006 Isuzu i-350, 2004-2006 Chevy Colorado, 2004-2006 GMC Canyon and 2006 Hummer H3, making this a targeted replacement set.
• Ignition coil construction: Coils are built with silicon steel cores, Japan-imported rubber, and Germany-imported varnished wire to improve longevity and heat resistance.
• Spark plug design: Iridium electrode and engineered ceramic in the 5019 plugs promote quicker starts and stronger acceleration after installation.
• OE cross-reference: Supplied with multiple OE references such as UF303, 12568062 and IC414 to help confirm fit before purchase.
• Complete set: Sold as a set of five, providing all coils and plugs needed for applicable 4.3L/3.7L engines in one purchase.
• Manufacturer support: Backed by a parts manufacturer with over ten years in the aftermarket and a stated factory and developer network for product updates.

Who It's For

This kit is for owners of the listed mid-2000s Isuzu, Chevy, GMC and Hummer vehicles who are experiencing symptoms like engine shaking, hard starting, slow acceleration or rising fuel consumption and want a direct replacement to restore performance. It is also suited to DIYers and independent shops that prefer components with OE cross-reference numbers for quicker verification.

It is not ideal for drivers whose vehicles are outside the stated fitment years or who lack the ability to verify OE numbers; some customers reported fitment variance, so those needing an exact match should confirm part numbers before purchase or consult their dealer.

Pros & Cons

Pros

• Improves engine performance and cures misfires in many reported cases, delivering smoother idle and stronger throttle response.
• High-quality coil materials and iridium plugs increase lifespan and deliver reliable ignition under heat.
• Good value for a full set of five parts and generally straightforward to install for experienced users.

Cons

• Some customers reported fitment issues, so OE checking is necessary before buying to avoid mismatch.
• A few reports of corrosion and premature coil failure indicate occasional quality variance in real-world use.

Specifications

Our Verdict

This coil pack and iridium plug set is a worthwhile, budget-friendly option for owners of the specified mid-2000s Isuzu, Chevy, GMC and Hummer vehicles who need to replace worn ignition components and restore engine smoothness. Confirm OE numbers before purchase; when it fits, the combination delivers solid performance gains and good longevity for the price.

Frequently Asked Questions

Will these parts fit my vehicle?
Check the listed OE cross-reference numbers and the specific model years shown in the product details to confirm fit before buying.

Do the spark plugs use iridium?
Yes, the 5019 plugs in this set use an iridium electrode paired with a ceramic insulator for improved starting and acceleration.

Are all five coils and plugs included?
Yes, the kit is sold as a complete set of five coils and five spark plugs for the applicable engines.