High Performance Ignition Coil for Pontiac Grand Prix (2005-2008) 5.3LHigh Output Ignition Coil Set for 2005 2008 Pontiac Grand Prix (LS4 W Body) What it Does: Replaces the weak factory ignition coils with a high voltage 8 pack upgrade to eliminate misfires, stabilize idle, and ensure complete combustion under heavy engine loads. The Stock Grand Prix Ignition Weakness The factory ignition coils on the 5. 3L LS4 engine are notorious for premature thermal degradation due to their location directly above the exhaust
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High Performance Ignition Coil for Pontiac Grand Prix (2005-2008) 5.3L