[Dmitry at Pelican Parts]

Hello and welcome to the forum! Take a look at the link below to one of our site's DIY tech articles on the MAF - I hope that it helps you troubleshoot and hopefully resolve the issue.

https://www.pelicanparts.com/techarticles/Boxster_Tech/27-FUEL-Mass_Air_Flow_Sensor/27-FUEL-Mass_Air_Flow_Sensor.htm