I have a low speed light throttle only ping, my power cuts out intermittently, im throwing random ecu lights, after cleaning my maf the car bogs and wont run untill i turn on the a/c and rev it to 5k then its perfect. Im pretty positive that eithers its an o2 sensor or its the ecu and it never had the firmware update. So i was wondering which years can i swap into my 1990 ls400