Replace GMC Sierra 1500 Pickup Spark Plugs & GMC Sierra 1500 Pickup Ignition Plug. Discover Best GMC Sierra 1500 Pickup Combustion Plugs. Maintaining the spark plugs in your GMC Sierra 1500 Pickup is crucial for optimal performance and fuel efficiency. Regular inspection and cleaning can prevent misfires and extend plug life, while signs of wear such as difficulty starting, engine misfires, and poor acceleration signal it's time for replacement. When choosing new spark plugs, consider options like copper for better conductivity or iridium and platinum for longevity and durability. Always opt for high-quality materials to ensure peak engine performance, and for those looking to install themselves, ensure the correct gap setting for your specific Sierra model to avoid potential engine damage. With the right care and choice, your GMC?s ignition system will remain powerful and reliable, driving conversions through demonstrated expertise and value.