Had Round 5 of NASA NW this weekend, car felt like it was missing, not firing on all cyls, replaced wires that were questionable, ran codes nothing major, 81, 82 84 and 85, I would expect these. Any suggestions ? Fustrating weekend being down on initial power.

Car was OK at high RPM (still lacking but was up to speed of 145), juts sluggish at low RPM and you could hear a miss.