My guess is the harness is shorted to ground somewhere.
I suppose anything is possible but I've never seen a PCM with an internal issue causing an issue like you describe.
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69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700. 95 F355. 96 Carrera 4S. 59 Cadillac series 62 convertible.
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