can anyone help me out or point me in the right direction to, ive had the car/tune for 2 years now out of nowhere the a/f shot down. idle used to be 14-14.7 now its 10.4-10.6 not really wanting to risk it so its a idle data log only atm

 

What have you changed recently in the car ?

 

nothing other than a head gasket, other than that absolutely nothing. Even bought new fuel pump, stable 50-55 fuel psi.

 

So, you haven't changed anything... except a head gasket and a fuel pump. That means that you actually changed TWO things !!! Is the fuel pump the exact same part as you had before ? As for the head gasket... was the cylinder head surfaced ? Is the new head gasket the same thickness as the previous one ? Are you sure the engine is in proper mechanical time ?

Tunes don't change on their own... so, if you haven't made any changes to the tune, the reason for the dramatic A/F changes are a change in the engine. It is either something you have done OR something like a failing sensor that is altering the fuel delivery.