Ignition Coil Pack & Spark Plug Kit for GM 3.6L V6 - Restore Smooth

In this review the kit is evaluated for owners of GM 3.6 L V6 engines who need a direct replacement ignition kit. This CUSTONEPARTS set of six ignition coils and six iridium spark plugs is aimed at Chevy Traverse, GMC Acadia, Buick LaCrosse and Cadillac SRX/CTS models from the years listed, and the single biggest reason to buy is its direct-fit design that targets common LLT/LFX misfire codes and restores smooth idle and throttle response.

Key Features

• Direct vehicle fit: The kit is designed specifically to fit a wide range of GM 3.6 L V6 models so installation matches OE fitment without modification.
• Six coils plus six plugs: The complete six-pack of coils and iridium plugs replaces worn components across all cylinders for consistent firing and reduced misfires.
• Iridium spark plugs: Double-iridium tips are pre-gapped to 0.040 and are rated for long life, helping maintain ignition performance up to 100 k km.
• High-energy coils: Coils are epoxy-potted with stainless springs and ferrite RFI suppressors to deliver clean spark output at up to 35 kV for efficient combustion.
• OEM number compatibility: Replaces common OE references such as UF569, 12590990 and related numbers to simplify parts selection for repairs.

Who It's For

This kit is best for owners and DIY mechanics who have GM 3.6 L V6 vehicles showing rough idle, throttle hesitation, or P0300-P0306 misfire codes and want a full cylinder-by-cylinder replacement in one purchase. It suits model years commonly fitted with LLT or LFX engines including GMC Acadia, Chevy Traverse, Buick LaCrosse, Cadillac SRX and CTS.

It is not aimed at vehicles outside the listed 3.6 L GM fitments or buyers who need a single coil or plug rather than a full six-pack; those users should source individual parts or confirm compatibility with their engine code before purchase.

Pros & Cons

Pros

• Complete six-coil and six-plug kit eliminates cross-matching and ensures even cylinder performance.
• Iridium plugs with pre-gap and long life reduce frequency of spark plug service intervals.
• Coils include RFI suppression and epoxy potting for durability and stable spark delivery.

Cons

• Fitment is specific to GM 3.6 L applications, so it is not universal and requires verifying year and engine code.

Specifications

Package	6 coils and 6 iridium plugs
Replacement OE numbers	UF569, 12590990, 12618542 and equivalents
Spark plug tip	Double-iridium
Plug gap	Pre-gapped 0.040
Coil features	Epoxy-potted, stainless spring, ferrite RFI suppressor
Intended engines	GM 3.6 L V6 (LLT / LFX)

Our Verdict

The CUSTONEPARTS ignition coil and spark plug kit is a practical choice for owners of GM 3.6 L V6 vehicles who need to address misfires and rough idle across all cylinders. Because it provides direct-fit coils and long-life iridium plugs in a single package and replaces common OE numbers, it represents good value for a full ignition refresh when the vehicle matches the listed fitments.

Frequently Asked Questions

Will this kit stop P0300 or P0306 codes?
In many cases replacing all six coils and plugs resolves P0300-P0306 misfire codes on affected LLT/LFX 3.6 L engines when misfires are ignition-related.

Are the plugs pre-gapped?
Yes, the included iridium plugs are double-iridium and come pre-gapped to 0.040 out of the box.

Does this replace specific OE parts?
The kit is offered as a replacement for OE references such as UF569 and 12590990 and other listed equivalents, simplifying OE cross-reference.