Report "I replaced the ignition coil,fuel filter and oxygen sensors on my 2001 daewoo lanos..i am still having problems with the car not wanting to go up hills. when i drive the car on flat surfaces it runs okay.. what else could be the problem.. i took it to autozone and it came back with 3 codes.p0303 p0171 and p0131 what does this mean.. i got the car checked in mexico and i cant read spanish.. help"