you will need to read that engine light.
have you done the basic things ?
how does the oil, engine coolant look like ? any smoke ? how does the exhaust gas smell?
Burned milk smell. .. any idea where it is coming from? if it's sweet might be coolant.What about wheel? the are not hot right ?
any chance of clogged exhaust or egr ?
if you suspect fuel delivery how is the starting of the car ? Tried cleaning air filter, MAF and MAP sensor ?
Tried pulling out the spark plugs ? How do they look like ? Any oil on them or fouling ?
Seems the car has done a lot of miles and was it taken care of ?