Car cranks but has misfire, code P0300

Welcome to 2CarPros.

When you replaced the sensor, did you use the paper spacer to set it correctly? Here are directions for installing one. Make sure this is what you did. The attached pics correlate with the directions.

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REPLACEMENT
Camshaft Position Sensor
pic 1

The camshaft position sensor is installed in the timing belt housing cover above the left camshaft sprocket.

REMOVAL
1. Disconnect the negative battery cable.
2 Remove the upper intake plenum.
3. Disconnect electrical connector from sensor.
4. Remove camshaft position sensor screw.
5. Pull sensor up out of the timing belt housing cover.

INSTALLATION

Paper Spacer
pic 2

If the removed sensor is reinstalled, completely remove the old spacer from the sensor face. Attach a NEW SPACER to the face of the sensor before installation. If installing a new sensor confirm that the paper spacer is attached to the face.

1. Install sensor in the timing belt housing and push sensor down until contact is made with the camshaft sprocket. While holding the sensor in this position, install and tighten the retaining bolt to 12 N.m (105 in. lbs.) torque.
2. Attach electrical connector to sensor.
3. Install the upper intake plenum.
4. Connect the negative battery cable.

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If you followed that correctly, take a look through this link to see if anything helps.

https://www.2carpros.com/articles/car-cranks-but-wont-start

Also, check to make sure you have spark to the plugs, an injector pulse, and proper fuel pressure.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

https://www.2carpros.com/articles/how-to-test-an-ignition-system

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I'm not sure what prompted you to replace the cam sensor, so let me know that. Also, keep in mind that an engine vacuum leak can cause a random misfire, too.

Let me know if any of this helps or if you have other questions.

Joe