Help with a miss and voltage drop

Forgive me but what is A/C component? I dont have AC. Also i just swapped in brand new ICM and eCoil. Reset idle and timing and mixture. It is still doing random misses, and with idle
Now around 550, that miss almost feels like it wants to stall. What can i trouble shoot now? Wires are 6 months old Denso 7mm. Plugs are 6 months old NGK . I have put less than 300 miles on these....