I plan on replacing my plugs with some upgrades since they are about 20k mi. old and I am sure they are a bit oily. Could adjusting the timing help emissions though? B/c i never touched the timing and then after I bought it I think the emissions place played with it when they got the car to pass by replacing the plug wires and plugs, b/c after that $120 emissions check the car has always pinged alot like stated above. And I am sure it is pinging though, b/c it doesnt do it at all at WOT.