Sits ontop of the spark plugs. SP20 runs 1 coil pack per 2 cylinders.
It's purpose is to basically amplify the spark.
So if they are dieing you will end up with a weak spark.
Probably the most simple way I could put it.
If you can wait until the next meet up I could chuck a set of mine in your car for a couple of weeks and see if anything is different.
__________________
|