I'm installing an '01 LS1 in my '81 Z. It starts but won't stay running. I'm using a Rick's Hot Rod Shop Stainless tank with the GM LS1 fuel pump that they supply. The only codes I'm setting refer to the vapor canister which I have not re-used from the donor at this point. It runs for 2 to five secs. but then quits. I thought I have the anti theft by-passed but maybe not. No theft codes setting. Any suggestions.