Engine died down at high RPM.

[THEFERMANATOR]

First things first, get you a helper and go for a ride. Have somebody pump the primer while it is acting up and ses if that clears it up. If it doesn't change anything, swap the powerpacks from side to side. Then see if the wet plugs clean up and the good ones look wet. The simplest ignition diagnostic tool is a spark tester with an adjustable gap in it, you can get them from any auto parts store. Open the gap up to at least 7/16" and check each wire idividually. If you have GOOD bright spark at each cylinder then most likely it isn't an ignition problem. The proper tool is a peak reading volt meter. MAKE CERTAIN THAT IT IS A PRV STYLE METER! Just because your meter says it will measure peak voltage, doesn't mean it will read correctly. My DVOM would read barely good on some systems and great on others, but with the CDI PRV adapter it reads consistent voltage. If you don't have access to one, then try swapping the packs from side to side. This will help you to narrow it down if it's a pack or not. The PRV eliminates alot of the guesswork though.