My friend got his car tuned Neptune h22 id1000. After getting a car tune I alway correct iat ect and some other stuff. I do this to so the car always runs good no mater the out side temps. My cars have run flawless and alway consistent. My friend ask me to do this to his car so I started I noticed the battery offset was set to stock injectors and he has id1000. I want him to let me set them for Id1000s and tweak them like I do my car. Then street tune the afrs to desired values. He is hesitant to do this and the car runs like crap. I think it's the battery offsets causing the problems.

 

that should be the first thing done if they're not correct.

 

I have always tuned my own cars. That is the very first thing I do also