Cole Curtis

So i've swapped a 006 dbw 25.3l into a third gen camaro. H/C done with no tune yet. I have a scanner hooked up to it. It runs great while cold and pulls hard. o2 sensors fluctuate normally for .1-1.1v. Fuel pressure is a little low at 55 in the rail. But when the ect hits 195 which I believe is when the thermostat opens up and such the o2 sensors stop fluctuating they go to about .07 and .03v and stay there and I can't get the car to move. I haven't tested the fuel pressure when it does this yet might be heat sink for the pump, but it happens everytime I hit 195. No codes thrown or anything. I'm out of any other ideas. Help?