Yeah most likely battery. I'm not trying to scare you, just trying to make you aware of what COULD happen if the battery wasn't the issue.

 

Ok, just replaced the batt. still wont start!

 

just throwing this out, but can it be something completely different? Like your alternator or starter?

 

well, its cranking. I just changed the plugs, and that didnt do anything! IDK I just had it going 1 week ago

 

If something went it could be fine one day and broken the next. Can't auto zone test your starter and or alternator?

 

Try starting it with a stock ECU, mine has 750cc and was STILL able to run. This is what made me come to the conclusion that me EMS was fired, which it was.

 

The it doesn't start with the stock ecu it has to be something else that is need to start the car.

 

with my stock ecu it starts and dies, put aem back in and it just cranks?

 

how cold is it where you are it. I sometimes have a hard time cranking if it is really cold.

 

What size injectors? Try giving it a little bit of throttle when it starts on the stock ECU, if it responds and runs it seems your EMS may be the problem.

But the fact it starts on a stock ECU is already a good indication of that.