I put a new battery in my 2003 chevy truck and now it is stalling and i don't know how to reset the computer

my 2003 camry did the same thing when i changed the battery. this is how i fixed the problem. this is very easy to fix, take the car on the freeway or highway and get the speedometer up to 65mph for a few miles then get of the highway shut the car off wait 30 sec, then turn on the motor while in park and rive up the rpm's up to 4000 and then let off the gas it should reset the idle back to normal

I suggest that you take it to a repair ship and have them hook a machine up to the computer in your car to do diagnostics so then you would know what exactly is going on so you could fix it once and for all.

The throttle body needs to be cleaned, grime in this area prevents the throttle plate from closing completely and allowing air to enter, making the air/fuel mixture lean. Make sure to clean the front and back sides of the throttle body. Also, disconnect the battery during the cleaning process to allow the computer to reset and relearn to the cleaned throttle body.
When you changed the battery, the computer was reset back to factory settings and with a dirty throttle, the fuel/air mixture is incorrect.

You didn't post a year or engine size. Anyway they all have a keep alive memory. After the battery is disconnected for 30 minutes this resets to factory settings. This doesn't cause a stall problem. A little rough idle maybe. When installing a new battery most people don't know to hook the positive side up first. This way will not cause a spike to the ecm or any other computer. Spikes can damage computers. But this is not a common thing to happen. I would check it for codes and go from there. There are alot of sensors that will cause a stall. Bad vacuum leak, MAF sensor,Dirty air filter, dirty fuel filter and so on. Let me know RAndy

Might be a bad Idle Air Control valve.

reset the alarm/immobiliser system.the car thinks you are trying to steal it.......

When you changed the battery the computer must re-learn the setting again. If it continues have a OBD II reader plugged in and check for codes.

If you disconnected the battery,the computer loss it`s memory,it will have to be reflashed at the dealer.

try changing the air filter ,i had a problem ,at ilde in drive my trailblazer would stall, changed the air filter now it's not stalling and got my power back ,there is a secondary air pump that i have to change ,
not sure were it is ? still not running perfect but it's running better .and my service light is on too.
i got it put on scope ,it's the pump .
not sure if this helps ,but i'm start to run in to problems too,i have a 2004 trailblazer.
i like to do fix things myself ,i hope i can.it's the cost if you know what i mean.

get the right size wrench that u need and remove the cables off of the battery take out the battery put in the new put hte black cable on first and then the red make sure there good and snug but dont overtighten them