first off i have a 2002 lincoln ls v6, and i would like to know what are some of the signs to having oil in the coil pack wells, needing new spark plugs, leaking valve cover gaskets and needing a new pcv valve? by signs i mean performance of the car any noises and so on. ur feed back would b greatly appreciated!!!.

Misfiring, puffs of smoke from under the hood when sitting still, poor fuel mileage.