[s-cars] Checking for spark

[David Forgie]

I agree with Tom. In addition you can use a FLAPS coil tester to test the individual coil strength. I assume you are getting some missing at higher boosts. This is usually the sign of a weak coil. 
The coil tester will allow you to find the culprit 

Example coil tester: http://i.ebayimg.com/00/s/MTEwMFg4MzY=/z/B9wAAOSw~CRTqETU/$_57.JPG 

One missing and hesitation diagnostic: 

http://forums.quattroworld.com/s4s6/msgs/22611.phtml 

Good luck 

Dave F.