sometimes when i am driving randomly the CEL light will pop on in my 91 hatch back.. it dont seem to do anything but only way to get rid of it is to turn key off and on again.. but the code it leaves is 43 , fuel system something... what would this mean and what would i check ? its running on an 90-91 ls ecu , this happens every once in a while not very often . its a b18a

 

check ur o2 sensor..............

 

i got an ls in my hatch and yeah its o2 sensor get a new one