OK.. I think I fixed it. First I´ve got new O2 sensor. It helped but not that much. So I went trough my knowledge brain database and find out)) that last think it could be is Coolant temperature sensor. Becasue It´s responsible for mixture regulation according to temperature of the engine. Ok I installed that. It stopped really bad missfire. But still I had some lose in performance. And I look around my engine bay and sudentlly all bad stories about Accel coil pack came back to me. I took this crup out and I put my original coil pack. It helped dramatically. My car was almost runing good. After about hour driving I realized that my computer is calibrated to my old MAF and new one that I got with bigger MAF housing could be calibrated differently. I stopped and put my old MAF on. All problems dissapeared. So the final thing is DON´T EVER BUY ACCEL STUFF. IT´S GARBAGE!!!! I had that pack on for less then 3 months,!!!