what engine, what ignition etc etc.... you have dual spark, or are your sparks actually duelling with one another??
Your question requires more clarification.
4age 16valve JDM Sprinter.... I will go and take a photo of it at the mechanics so you can see what I'm talking about. Yes it has dual spark. I am new to Toyota so you'll have to bear with me! Had my old Nisssan for 3 years and only know my around them!
Thanks...