If you own a VW golf/jetta IV and have noticed a loss of performance and an occasional engine misfire ( especially if it has rained recently) you might need to replace your ignition coil. But don't sweat it, it's actually sounds much more complicated than it is. You just need to remove the secondary air pump that is in front of the ignition coil and have at it. You'll need a socket set and some hex wrenches. However, while you are at it, it is a good idea to replace the spark wires and spark plugs too. This will require some really long extensions for your socket driver and maybe one of those super long needle nose pliers.
A great parts resource is ECS Tuning.
