I unplugged the computer under the passengers seat and disconnected my battery when drying out my car. Now my car will start and try to idle really low but die. I didn't fully disconnect the battery I only disconnected the ground.

 

What kind've car?, is the ecu clipped all the way in? Why were u drying out the car? Did you get water in the fusebox? Can't really help unless your more specific

 

Oops thought I ended this... It was just my idle speed had been turned down a while ago before working on it. So it wasn't getting enough gas.