ok this is my first post on this website. anyway, i got a 2001 gti glx a few months ago. 127XXX. all stock. nothing wrong except airbag light fault. the other night i drove from milwaukee area to chicago. and on the way back i noticed the check engine light was on. i checked with a scanner and found 4 codes. > p0340, p0300, p0304, p0301. when i start the car i can smell the gas almost instantly. the exhaust sounds louder and worse. and also the gas pedal seems the sorta vibrate when reving the engine a bit and is also less responsive. i havent been driving it at all since and need to find out how to fix it or what could be causing it. any information would be useful and thank you in advance.
the only thing i think could of caused this was that i spun the wheels a bit at a toll booth and revved the engine a bit through tunnels but not even alot.