Torinalth has a great point. You might need to upgrade to a better ignition system. Also, your car has a returnless fuel delivery system (stock). Alot of people say (and I would have to agree) that returnless fuel systems are bad when using boost. It causes detonation and failures. I would look into:
1. The fuel system..ask around about boost with the returnless system.
2. Ignition (MSD or Crane).
3. Different plugs.
4. Your timing. May need to fine tune.
5. Did you upgrade your fuel injectors and mass air?
Cheers
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