That's odd...maybe I had a different problem. The truck would be driving along the street, and the ignition would just start cutting out. Felt almost like it was running out of gas, but the tach needle would dive from 2000 to 0 and then go back to 2000. It felt like it wasn't sparking for a second and then started sparking again. It hasn't given me any trouble since I added the resistor. Hopefully it won't. Ah well, I'll see how it goes...