Many report good success with the NGK, but also depends on exactly which ones you got.
Honestly for the price I just go with Bosch plugs. It's simpler and it is what comes from the factory.
Since you just did plugs the issue you are having is going to be plug related....or the parts you took off/put back on as part of the process. Prefer myself to just do it once and be done with it then try to save a few dimes.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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