Originally Posted by NissanZ34

I finally got the car tuned on EcuTek and with RaceRom feature and on my way back the check engine light came up but the car was still running fine. I even tried the car and it was quick and fast for the short time I was able to drive it without having the loss of acceleration. Then a couple days later the CEL is still there but it was flashing during acceleration and at that point I had no power. The idle is fine and it does not sound abnormal. The spark plugs were changed by the tuning shop. I have an appointment to the dealership to have the oil changed and check the codes. What should I try by myself to solve this in the meantime?