The reason your truck wont fire off until after you let off of the key is due to how you have it wired up. Stock, the LUV is wired with two wires connected to the ballast resistor. One comes from the ignition switch "run" terminal, the other from a relay that supplies battery voltage to the coil while cranking. The relay is in that box mounted on the right side fender well close to the cab. Take a look at the wiring schematic's that the web site has on it's info page.
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