Check coils, primary 2.0 ohms secondary 32k ohms, i dont know what happens or how to test for high rpm conditions though where they may fail at making good spark, a part can test good at rest but coils and injectors are asked to work very fast over and over time, 15 years, and i think they kinda fail maybe when we ask for 80 90 100 percent. i must say i really dont know but im studying on coils, injectors, now to learn about them as the drag only build will have a stand alone ecu and these times can be adjusted then so massive learning curve.