Mercury - Idle Air Control Valve Gasket MPI Engines 8M0119616. Overview. Most boaters don't think twice about idle quality-until it starts acting up. A steady, confident idle is one of those small comforts that sets the tone for your whole day on the water. When your engine settles into a smooth rhythm at the dock or when you're easing through a no-wake zone, that calm steadiness comes from a handful of small but crucial components working perfectly together. The Mercury 8M0119616 Idle Air Contr