{"product_id":"ignition-coil-spark-plugs-for-chevrolet-suburban-1996-1999-5-7l-7-4l","title":"Ignition Coil + Spark Plugs for Chevrolet Suburban (1996-1999) 5.7L 7.4L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eOEM-Grade Ignition Coil and Spark Plug Kit for 1996-1999 Chevrolet Suburban (GMT400)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The complete ignition kit restores high-voltage secondary delivery and combustion efficiency on the 1996-1999 Suburban to resolve high-load misfires and rough idle.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet Suburban Thermal Degradation Problem\u003c\/h3\u003e\n\u003cp\u003eFactory ignition coils and plugs on the \u003cstrong\u003eGMT400\u003c\/strong\u003e platform endure severe thermal cycles within the engine bay, especially under sustained towing loads. Over time, the factory coil's internal winding insulation suffers thermal breakdown, resulting in secondary winding voltage leakage and dielectric punch-through. Concurrently, factory spark plugs suffer center electrode erosion and gap enlargement, elevating the secondary breakdown voltage required to bridge the gap. This combination causes intermittent ignition breakdown, erratic timing synchronization, and unburned hydrocarbon wash that compromises catalytic efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis direct-replacement kit pairs a high-output ignition coil with eight matched spark plugs designed to factory heat range tolerances. The coil features premium magnetic steel laminations and dielectric epoxy potting to withstand high underhood ambient heat, preventing internal arcing and heat soak saturation. Engineered to exceed factory output specs, it consistently delivers the required secondary voltage to fire the ground and center electrodes under heavy throttle, matching the OEM resistance parameters of \u003cstrong\u003e10489421\u003c\/strong\u003e and \u003cstrong\u003eD577\u003c\/strong\u003e.\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;\"\u003e1996-1999 Chevrolet Suburban\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 5.7L L31 \/ Vortec 7.4L L29 \/ \u003cstrong\u003eGMT400\u003c\/strong\u003e\n\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;\"\u003e255–290 hp \/ 330–410 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;\"\u003e\n\u003cstrong\u003e10489421\u003c\/strong\u003e, \u003cstrong\u003e19207138\u003c\/strong\u003e, \u003cstrong\u003e19418996\u003c\/strong\u003e, \u003cstrong\u003eD577\u003c\/strong\u003e\n\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\u003e1996-1999 Chevrolet Suburban 1500 5.7L V8 (Vortec \u003cstrong\u003eL31\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003e1996-1999 Chevrolet Suburban 2500 5.7L V8 (Vortec \u003cstrong\u003eL31\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003e1996-1999 Chevrolet Suburban 2500 7.4L V8 (Vortec \u003cstrong\u003eL29\u003c\/strong\u003e)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GMT400 Suburban?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1996-1999 Chevrolet Suburban equipped with the \u003cstrong\u003eL31\u003c\/strong\u003e 5.7L or \u003cstrong\u003eL29\u003c\/strong\u003e 7.4L engine.\u003c\/p\u003e\n\n\u003ch4\u003eShould spark plug gap be confirmed before installation?\u003c\/h4\u003e\n\u003cp\u003eYes, always verify the plug electrode gap against GM factory specifications with a wire feeler gauge prior to torqueing into the cast iron cylinder heads.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for high-stress utility, this ignition hardware delivers sustained secondary spark voltage to maintain reliable combustion during heavy trailering and full-load hauling across extreme duty cycles.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67518811898104,"sku":"DS-E04UVY8WJ","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-suburban-1996-1999-5-7l-7-4l-1.jpg?v=1790370451","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-spark-plugs-for-chevrolet-suburban-1996-1999-5-7l-7-4l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}