i just got duals put on my truck and there everything i wanted except the check engine light comes on and it's a pain i read somewhere about a mil eliminator but when i went to the sight on how to make them it did not work, i was wondering if anyone could help me get rid of my problem

 

Have you tried resetting the computer? If not, that is your first step. Disconnect the battery, turn on the headlights (this drains residual power) let it sit 10-15 minutes and then reconnect. Then start the truck up and let it idle for 5-10 minutes then drive for another 5-10 minutes. This will reteach the computer.