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Rb25 misfire

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Hi my rb25 has developed a misfire, seems to get worse with heat. It runs e70, yaris coils and ngk bcpr7es sparkplugs. Link ecu. 30 psi boost, 600hp When i drive in after 1 lap i can take connector off coil 6 and 4 and there is no difference in engine tone. If i leave it an hour to cool it seems to be ok for a very short time. Any ideas what could cause this guys?

Also have done compression test 150 psi on all cyclinders