I have an lq4 in my 00' ss with 853 heads the car runs strong good oil pressure but it can hold idle i have a predator but i need help tuning, i have the basics down but i am throwing codes too lean both banks missfires every were timening @ 41 degrees i have riven it for about 400 and i am nervous. I don't have money for a tune
any suggestions?

 

You can only do so much with a handheld. You need to save your money for a tune or save up to but HP tuners or EFI Live for yourself. You can unload the preditor out of your pcm and get about 200 for it on here.
There are people on here that can get you a mail order tuner for cheap just to get you going. Till you have some more money to get the software you need.

 

Thanks for the response !!!