Usually it means that the oil needs to be changed, or that a belt of oxygen pump needs to be replaced. If it's letting you know it's detecting something, that means that it's not that bad, but needs to get fixed.
probably got a bad IAC motor
That is one of many possible causes.
Engine surging is usually due to insufficient fuel supply. Probable causes could be an air leak in the fuel system, or possibly a dirty fuel filter, causing fuel restriction.
Dead battery, bad starter, sieged motor. Sounds like it's electrical. On_mitch
head gasket? its stuffed mate!
Meteors, or asteroids.
The most probable cause is poor fuel or water in your fuel. This could also be due to the timing being out of proper adjustment.
well it needs to be serviced...soon
service engion soon light is on
The problem was not fixed with a tune up, or the light is on because it was not reset by the service station.
the computer tells it to glow.
This is most likely a severe failure somewhere internally in the engine that resulted in coolant in the oil. different root causes are probable. oil should be checked regulary (do a oil sampling) after it has been replaced.