My advice to a lot of you guys is to change and install new coil packs. No one should still have 18 to 20 year old coil packs on their car like I did. This plus plug and spark plug wire change has made a world of a difference with the idle,power and fuel economy. Feels like a brand new car. Especially power and idle wise. Also if you know how change your valve cover gaskets and reseal your valve cover breathers. Change all vacuum lines as well. These things as well make a difference.