Replace Ford F350 Super Duty P/U Ignition Plugs Replacement. Order Ford F350 Super Duty P/U Spark Plugs & Best Ford F350 Super Duty P/U Combustion Plugs. Maintaining optimal performance in your Ford F350 Super Duty P/U hinges on the health of your spark plugs, a vital component for efficient combustion. Spotting signs of wear, such as difficulty starting, engine misfire, or poor fuel economy, signals it's time for a replacement. Extend the lifespan of your spark plugs by ensuring your engine runs on the correct fuel mixture and adhering to scheduled service intervals. When choosing new spark plugs, select from copper, platinum, or iridium, each with unique conductivity and durability characteristics tailored to your driving demands. High-quality materials and correct gapping during installation are essential for peak engine performance, making your online purchase a seamless gateway to maintaining your truck's powerhouse.