normally the diag plug is on the n/s/f of passenger strut tower the two terminals you need to bridge are TE and E1 then turn the ignition on and the engine light should flash eraticly if it flashes constantly with no changes then it is all ok. is it running the map sensor or the airflow meter ???????? if they go out of sink they will put all the other sensors out my first thaught would be sumthing has gone out of sink and fould up the o2 sensor that will giv you that simtem.... remove it see if it has heaps of black shit (carbon) all over it ???????? clean it then disconnect the battery to reset the basic settings then see how you go....... very interested to see what the cause is