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this would suggest possibly a faulty temp sensor, or something else in the drive-by-wire system (pedal, .computer, throttle)
for this type of issue, if no warning light comes on, with only a mild symptom, you will likely need to have real time diagnostics carried out while the issue is presenting itself, using a scan tool which can monitor all inputs and outputs from the engine control system in real time, in order to attempt to identify what may be out of spec
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