I disconnected the battery to clear the check engine light, now the car won't start. The light is off, though. The car will run for about a second, then it dies. We just replaced the fuel filter four days ago or so. I guess that I'm going to try replacing the spark plugs (they're) all fouled up. I believe that's from whatever condition that the car had which was why the check engine light was on. I was going to go to Autozone and have them run the codes, but the car is undrivable now. Does anyone know what I should try next? I need to get rid of this car!

I replaced the Mass Air Flow Sensor and now the car starts.
Thanks for all the help guys!
Say goodbye Hyundai- We're sellin ya!

Instead of disconnecting your battery to reset the check engine light, try pulling the ECU fuse under your hood for a minute or 2....Way easier.

You are going to sell your car because of a bad mass airflow sensor???
go and look at all the other forums on this web page and see all and I mean all the problems people post about and then look at this page and see how few problems peole are having.
Before I bought my new car thats what i did and i can tell you for a fact that Hyundai has the least problems of all.