i the wiring going to the fue box bad or is the ecu bad?
Put a fuse that is correctly rated for that slot. Turn the ignition on (engine off) and see if the fuse pops. Right now you may have a short in that system. You need to recreate the situation that popped the fuse in the first place. The only way for wiring to go bad is to draw to many amps through the wires that will in turn, melt the wires. The fuse box is there to protect the vital components of the car. If the mass air flow sensor is not working, the car will not stay running. It will start, but not stay running.
