just replace your coil-packs you should be fine.
with new coil pakcs, you dont even need to gap your plug down which basically reduces power. trust me, its worth the investment.
get it from Jay Marks Toyota, I think they go around $360 for all 6.
afterwards, just get stock gap plug thats 1 degree colder you should be fine.
you miss cuz your spark can not jump to the other end of the plug tip= weak spark=weak ignition.
trust me I went though this issue, new coil packs will fix your miss problem. if you want your ignition to be even stronger, then go with HKS twin power or good old MSD.
now if your car detonate or knocks, that is differnt story.
I am running 18psi with new coilpakcs, stock gap, 1 degree colder, perfect combination for our turbo cars.
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