1. Could be faulty oxygen sensor that screws up your air-fuel ratio readings.
2. If you have replacement ECU or piggy-back installed and you have put in new tuning bits, could be the settings/mappings need to be checked
Just wanna open this discussion abotu who is the best mechanic for RE cars in town.... So all RX7 owner hv better idea where and which mechanic to go for when the car is sick. Is better to go for those professional...