I have been having some problems with my car starting for a while now. At first I thought it was my starter or my opti. Well come to find out it was neither one of those. It was my dang fuel pump. It was only feeding out like 25lbs. Not good at all! Then imediately after turning the ignition off it wall fall back to 0. Good thing my warranty covered this because the pump alone was $400 from GM.

I posted this because I have seen where people were having similar problems in the past. You may want to check your fuel pump because if its running to lean it can lead to other things.