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I got the engine code P0121 on my 2007 Chevrolet Silverado, what should I check first?

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I got the engine code P0121 on my 2007 Chevrolet Silverado, what should I check first?

Vehicle: 2007 Chevrolet Silverado

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P0121 TP (throttle position ) sensor circuit

Check for any vacuum leaks, and proper mating of the TP sensor.
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P0121 CHEVROLET Code - Throttle Position Sensor 1 Performance
Read more: https://www.autocodes.com/p0121_chevrolet.html

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