As per the factory service manual, set timing to 5 degrees. Make sure you are properly grounding the ECU when you do it.
This is called setting the base timing. Basically, it is setting the timing mechanically and not letting the ECU butt in to change things yet.
Disconnect the grounded timing wire and check timing. Now the ECU is controlling it and it should be around 12 degrees at idle.
Please note that you should make sure your idle is set correctly and engine is warm.
more info