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I had a similar problem to this - it was intermittent sometimes it would fire right up, other times had to hold the key and wait. Very frustrating for a race car when you are headed to grid.
Turned out to be a failing relay in the alarm box. I opened it up and replaced the relay on the board and it was good to go, but the easiest way to fix it would be swap in a matched set of ECU, Key Pill and alarm box
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