Sniper troubles

Sniper EFI system has been on the engine for only 1000 miles, but is already failing. When hot, the engine will run fine but suddenly stumble, idle speed increase to 1800, IAC valve will go full open but show 0% on the 3.5 handheld display. TPS value will briefly show -10% (red) or 0% regardless of throttle input. Seems like a brief reset. Usually the engine will die about 15 seconds later. Rechecked the electrical connections +/- and ignition input. Currently undriveable.

Might remove the Sniper EFI system and in-tank fuel pump and revert back to mechanical fuel pump and carburetor.