well, if you think about what is going on, you can sorta find the problem- you need to spray a super flammable fluid into your motor to make it start- we know that the three things you need to make a car run are fuel, spark, and air.
- Since the car does start there is def. air
- there is most likely fuel since the car eventually starts and runs on it's own, however you could have a terrible tank of gas, or water in the gas tank
- spark could be another thing though- you may have a weak spark and it isn't strong enough to start the gasoline, only the starter fluid, go through your ignition system, maybe do a little tuneup- cap, rotors, plugs, plug wires and see what that does- that's all i can think of
Could be fuel or spark
Do general tune up of ignition system
Check out the fuel system
PS- i'm not sure using starter fluid on a fuel injected car is good- i've never done it, because i always had the preconceived notion that the components of the starter fluid could be highly corrosive to any plastic in the intake stream- I only use that crap for starting the lawn mower- dunno if i'm right though-