What could cause this to happen? Was making a pass at my local Dragstrip and car died at the top of 2nd gear. Came back and pulled codes and got a P0174 bank 2. This is not the first time this has happened. Any ideas? Weather was 62deg 30% humidity

 

car tuned?

 

Any mods or recent work done? Give us some more info man.

 

Nope No Tune

 

Removed air filters
Underdrive pullies
2007 VQ35HR upper intake swap https://www.myg37.com/forums/intake-...e-vq37vhr.html

 

I would start with checking your manifold vacuum numbers during those events, A lean code could also be triggered by an exhaust leak. Being at the drag strip you meet criteria for both conditions to happen.

 

Most likely vacuum leak, Not sure if you installed manifold correctly.. Smoke test could give you an answer.