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A couple things. First, check your wiring a few more times. Make sure you have 50kohm resistors on the inputs for VSS and the injector as close to the board as possible. Second, make sure you used the right inputs for each one. VSS goes to digital pin 14, aka A0. Injector goes to both pins 2 and 3.
What kind of car are you driving? There could be some special injector or VSS signal or something that is causing the errors.
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