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Loosen the throttle stop screw: Find the small vertical screw near the throttle return spring. Loosen its locking nut and turn the screw counter-clockwise until it is no longer touching the throttle linkage arm at all.
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Find the contact point: Turn that same screw clockwise slowly until the very tip just barely touches the metal linkage arm.
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Set the final stop position: From that exact touching point, turn the screw clockwise 1/4 to 1/2 of a turn. Tighten the locking nut down. This stops the internal valve from getting jammed shut.
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Check for cable slack: Wiggle the throttle cable. It must have a tiny bit of physical slack so it isn't pulling the throttle open.
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Loosen the TPS body: Locate the black Throttle Position Sensor box on the side of the throttle body. Slightly loosen its two mounting screws so you can rotate the sensor by hand.
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Listen for the switch click: Rotate the sensor body all the way clockwise, then slowly turn it back. Listen closely for a faint mechanical "click" right as the throttle arm rests against the stop screw.
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Tighten the TPS: Lock the sensor down by tightening its two screws right at the exact position where it clicks closed.
