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ok you need to do some actual testing.
- theres TWO coolant temp sensors. one is for the instrument cluster. one is for the ECU. which one did you replace?
-what ecu are you running? what modifications are done to the engine? have you checked compression/leakdown? have you done a test for blown head gasket? is there white/grey/black smoke out of the exhaust? what do the plugs look like?
TONS of shit you should be checking, and you def need to fix that alternator before trying to further troubleshoot.
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