Did a v6 to lq9 swap in my 2000 silverado. Engine is in and running, but sometimes you have to crank on it for a little bit, and sometimes it start first crank. It still has v6 fuel pump fyi, not sure if their a psi difference. But once it starts it running ok until you quickly smash gas then it trys to stall out almost like flooding it. Then another issue is when its cranking trying to start i see sometimes gas spitting out passenger side exhaust manifold....thoughts???? O2 sensors arent plugged in behind exhaust manifold so its in lag mode with service engine light on.