Hey guys. Newbie here. I've been working on an LSA crate engine swap into my 1972 and have run into a problem. The ECU is an E67 from a 2012 CTS-V. I had the car tuned at a shop using HPT to remove the VATS and after installing the ECU, the engine fired but quit after a couple seconds due to the fuel pump not staying on. I am using a Vaporworx fuel controller and after recontacting the tuner, he forgot to enable the use of this so the ECU was shutting it off. So no problem right? I drive my round trip of 4 hours for the change, I put in the ECU and now I have nothing. No spark. No fuel. Pump lasts maybe a second. No pulsewidth at injectors. Injectors have power. Ignition wires all good. MODIS is showing no codes. I'm just stuck. I have the hpt file if anyone would be interested in looking at it for me. Just curious how I went from just a fuel pump issue to all of a sudden not having anything. Thanks!