my guess is u have to have a short somewhere. is it a standard ecu or have you put a aftermarket one in?.
check all wires for ecu harness around firewall area where it may have rubbed through or any other tight squeezes in the harness u might have.
ive seen some right behind the middle of the dash before and it took hours to find.
check the common areas first and eliminate them 1 by 1
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