Cisco Switching/Routing :: Editing And Copying Configuration 876 Router To Another

i have to configure 80 Cisco 876 routers, so i planned to copy config via tftp from one configured router to PC, edit it in text editor (change ip addresses, dhcp pools, vpn keys...) and then copy it via tftp to another router, etc... Configuration looks fine and it works when i paste it in cli, but when i copy it via tftp i'm getting strange problems like dhcp not working or snmp not accessible. Am I missing something.
 
Here's config from router with dhcp problem:
 
ROUTER#sh run
 
version 15.1
no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
service password-encryption
service sequence-numbers(code)