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Can't find solution for lack of performance when car at OPERATING TEMP.

I'm with sportsman2003 - sounds like high temp(s) are causing the ECM to reduce power output to prevent pinging. Verify that both radiator fans are operating properly (FSM will help;

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Old 03-10-2021, 01:36 PM   #4 (permalink)
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I'm with sportsman2003 - sounds like high temp(s) are causing the ECM to reduce power output to prevent pinging. Verify that both radiator fans are operating properly (FSM will help; link in sig). Check radiator for bent fins, pinched tubes, and anything else that might reduce air or water flow. Verify that temperature sensors are reading correctly.
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