ENA Ignition Coil & Iridium Spark Plug Kit 6-Pack for GM 4.2L L6 — Direct-Fit UF303 Replacement, 24-Month Warranty

ENA’s kit contains six direct-fit ignition coil packs and six iridium spark plugs engineered to replace worn ignition parts on 4.2L L6 GM-family engines for reliable starting and smoother running.

If your Trailblazer, Envoy, Ascender, Bravada, Rainier, 9-7X or a related model shows misfires, rough idle, or reduced throttle response, a matched coil-and-plug replacement set is the first maintenance item to inspect. This complete kit from ENA is built as a drop-in replacement for common OE part numbers (including UF303 and 12568062) and arrives with a 24-month warranty, saving you the hassle of buying coils and plugs separately.

How does this kit restore engine performance?

Replacing both the ignition coils and the spark plugs together addresses the two most common wear points in the ignition system. New iridium plugs maintain consistent spark energy and the coil packs deliver stable voltage to each cylinder, which helps reduce misfires and improves throttle response.

• Six direct-fit coil packs matched to GM 4.2L L6 firing order.
• Iridium electrodes for durable spark stability and longer service life.
• Replaces UF303, 12568062 and other OEM cross-references for exact fit.
• Complete kit avoids mismatched components and simplifies installation.

Will these parts fit my vehicle?

ENA’s listing covers a broad range of GM and GM-based vehicles with the 4.2L L6 engine and some 2.8–3.7L variants used in Colorado, Canyon and Isuzu passenger models. Always confirm fitment with the vehicle year, engine code and the seller’s fitment check before purchase.

• Common fits: 2002–2005 Chevy Trailblazer and Trailblazer EXT (4.2L L6).
• Also for GMC Envoy/Envoy XL and select Canyon/Canyon engine variants.
• Compatible with Isuzu Ascender, Oldsmobile Bravada, Buick Rainier, Saab 9-7X.
• Use the vehicle compatibility tool or VIN lookup to verify fitment.

How simple is the installation process?

ENA’s coils and plugs are built for plug-and-play replacement: mounting points, electrical connectors and spark plug reach are engineered to match OEM dimensions. Installation is straightforward for anyone with basic hand tools and a moderate level of automotive experience.

• Remove engine cover and unplug coil electrical connectors.
• Unbolt coils, swap old spark plugs for the new iridium plugs, then reinstall new coils.
• Follow torque specs for spark plugs and coil mounting bolts; anti-seize not typically required on iridium plugs.
• If unfamiliar, a professional mechanic can complete the swap in one service visit.

What warranty and quality details should I expect?

ENA backs the kit with a 24-month warranty and specifies direct-fit cross-references to help ensure compatibility with common OEM numbers. The components are intended to match factory form, fit and function rather than be a generic universal alternative.

• Includes six ignition coil packs and six iridium spark plugs in one package.
• 24-month limited warranty from the manufacturer.
• Listed cross-reference numbers to confirm match with OEM parts.
• Packaged to protect electrical terminals and plug tips during shipping.

Who is this for: This ENA coil-and-plug set is aimed at DIY mechanics, fleet maintainers and independent shops working on early‑2000s GM SUVs and related Isuzu/Olds/Saab models with the 4.2L inline‑6 (and select 2.8–3.7L variants). It's ideal if you want a complete ignition refresh in a single purchase—matching coils and iridium plugs—to stop misfires, restore responsiveness and reduce repeated part swapping.