P2138 but seemingly complicated

[Tyrannosaurus]

Sounds to me like a throttle position sensor. Rock Auto has them online for around $20 or so, you can change it yourself in about an hour with a basic tool kit, unless your can has an electronic throttle body, in which case you need to replace the whole body. Still pretty simple, only expensive if you go to a parts store.

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Okay I asked my mechanic and he said usually when those go bad the car will die when you idle? It's not dying at all