I have all these 3 codes at the same time.

P0173, P0134, P0455

The car keeps stalling when am in traffic and guzzles fuel so badly

I have changed the MaF, the Evap connected to the engine.


Please help

 

My first guess(es) would be that there's a vacuum leak somewhere in the intake, or that you've got a bad upstream (pre-cat) O2 sensor. This is where it would be helpful to have an advanced OBD reader - I use the Torque Pro app on my 'droid phone, with a Bluetooth OBD "dongle" that talks to my phone. With that, I can not only read / erase error codes, but can monitor a host of functions within the car's systems, including creating real-time charts of the O2 sensor outputs (which will tell you loads about what's going on).

Either a vacuum leak or potentially a bad upstream O2 sensor can erroneously tell your fuel delivery system to keep adding more fuel, since it's getting bogus data from your MAF and/or O2 sensor.