{"product_id":"ignition-coil-spark-plugs-for-chevrolet-silverado-1999-2007-4-3l","title":"Ignition Coil + Spark Plugs for Chevrolet Silverado (1999-2007) 4.3L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHigh-Performance Ignition Coil and Spark Plug Kit for 1999-2007 Chevrolet Silverado (GMT800)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The direct-replacement ignition kit restores correct secondary ignition voltage and combustion stability on the 1999-2007 Silverado to eliminate hard misfires and optimize fuel economy.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet Silverado Ignition Failure Points\u003c\/h3\u003e\n\u003cp\u003eOn the \u003cstrong\u003eGMT800\u003c\/strong\u003e platform equipped with the \u003cstrong\u003eVortec 4300\u003c\/strong\u003e V6, factory ignition components endure intense underhood thermal cycling. Over mileage, the stock internal winding insulation breaks down, causing epoxy potting micro-fractures that induce dielectric flashover and secondary voltage drops. Coupled with thermal electrode erosion on factory plugs, secondary circuit resistance rises significantly. This leads to intermittent cylinder starvation, erratic idle, P0300 diagnostic trouble codes, and lost low-end torque under heavy payload or towing demands.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis replacement kit resolves voltage drop by pairing an upgraded high-output coil with heavy-duty spark plugs. Built to supersede OEM reference \u003cstrong\u003e10489421\u003c\/strong\u003e and \u003cstrong\u003eD577\u003c\/strong\u003e, the replacement coil features high-grade copper primary and secondary windings encased in void-free epoxy resin for superior thermal dissipation and arching resistance. The included plugs feature corrosion-resistant nickel-alloy shells and durable center electrodes engineered to sustain consistent gap spacing under sustained combustion pressures, delivering crisp throttle response and stable burn rates.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e1999-2007 Chevrolet Silverado\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eVortec 4300 (LU3 \/ L35) \/ GMT800\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e200 hp \/ 260 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e10489421, D577, 19207138, 19418996, DR49T, C1098VC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1999-2006 Chevrolet Silverado 1500 4.3L\u003c\/li\u003e\n  \u003cli\u003e2007 Chevrolet Silverado 1500 Classic 4.3L\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GMT800 Silverado?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1999-2007 Chevrolet Silverado equipped with the Vortec 4300 engine.\u003c\/p\u003e\n\n\u003ch4\u003eWhy are 8 spark plugs included for a 6-cylinder truck?\u003c\/h4\u003e\n\u003cp\u003eThe kit supplies 8 plugs to provide two spare units alongside the 6 required for the 4.3L V6 service.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Durability Standard\u003c\/h3\u003e\n\u003cp\u003eWorking trucks demand rock-solid ignition reliability under heavy cargo loads and high-temperature hauling. This matched coil-and-plug kit restores original powertrain efficiency, ensuring reliable cold starts and sustained combustion under full gross vehicle weight ratings.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50626038628600,"sku":"DS-EE6Z8HDU0","price":74.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-spark-plugs-for-chevrolet-silverado-1999-2007-4-3l-1.jpg?v=1790354270","url":"https:\/\/performancechiptuning.com\/es\/products\/ignition-coil-spark-plugs-for-chevrolet-silverado-1999-2007-4-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}