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I tried to run my Nistune ECU, it did not worked, I put back the stock one, it started I drove it, park it and the next day tried to start it again and it does not start. I hear the starter cranking the engine but does not start. HELP PLEASE...

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if it sparked then it may have blown a fuse when it did so.

also make sure that the harness if plugged in properly. i have had a similar issue with a skyline before where it simply came down to the harness not being in properly. the car started, turned it off, went to start it again and it wouldn't start. stuffed around for hours trying to diagnose the problem. then i pushed on the harness a bit and the car started. then if i bumped it the car would stall

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