I hafe a w202 c230 kompressor, whit bigger Pulley on the Crankshaft and smaller pulley on the kompressor,

So it makes 1,1 bar,

But it is not drivning like it should, I can feel it pulling, and then it's lossing power, and get it again and lossing it, all the way up.

Can it be it gets to much air to the stock injectors?

Or can it just be my maf sensor,