Hi! Looking for ideas where to search issue: Miata NB 99, Rotrex S/C, Speedy EFI ecu, RX7 Injectors, stock coil pack.
Issue: Recently after track day i noticed that Air Flow ratio started to fluctuate from 11.5 to 13.5 as well as RPM while idle or when you keep any RPM stable, I tried to change coil pack (all 3 i have shows same behaviour) , changed spark plugs, checked injectors in laboratory, fuel pressure is stable and 60 all way, there is a spark in each cylinder.
When i am disconnecting any spark plug wire (no matter what cylinder) car start to work more stable as well A/F values becomes stable 12.9 and not fluctuating.
Basically i am trying to figure out where to search issue, seems like smth on side of electrical part, will appreciate for any ideas where to look at