Need help P0103 code

By far the most common cause for MAF related codes is the MAF sensor being disconnected, or not completely connected and latched. The best way to diagnose this concern is to use a capable scan tool and monitor the MAF sensor voltage with the engine idling. The voltage should be aprox. 0.6 to 1.0volts with the engine warm at idle. Wiggle the MAF sensor wiring (esp. at the connector) and tap on the sensor to see if the voltage stays in that range and remains steady. If you don't have a scan tool that will let you look at the MAF output you can listen for noticeable changes in RPM while wiggling the wiring and tapping on the sensor. If you find the voltage to be out of spec or the RPM changes you have found the problem. If you found a fluctuation when wiggling the wiring, you will need to change the wire harness connector.
Since you bought a new MAF sensor you can swap the sensor out and see if that corrects the concern, but MAF sensors rarely completely fail. With the concern present you should notice very poor throttle response. If the sensor itself was the problem, replacing it should result in normal throttle response.

I think I got that code once (At least I think it was that code)...This was 4 years ago...check your throttle body...mine was really dirty from the CAI. That might help your problem.