wont idle down
Make sure the throttle cable is clear and the throat of the throttle body is clear. It could be a bad throttle position sensor - get the codes read.
thermal temp sensor dead,,or sticking throttle control valve stuck open ,[most likely] or glitch in bcm or ecm or poor ground circuits or b+ shorting across to injection system and or any related fuel delivery components [hello] just guessing
also check the idle screw on throttle body, might just need backed down
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