Car is a 87 Daytona Shelby Z, log intake turbo 1 with a fwd perf computer. The engine just abruptly shut off while slowing to a stop light. Would not restart. Tried to run diagnostics, but check engine light (power loss) just flickers sometimes, other times just blinks like a turn signal, sometimes starts to blink like maybe a code 12 then disappears not to return. Sometimes can hear relays under hood being cycled. I suspect logic module is bad, but am looking for confirmation or advice. Took 3 hours to get a tow on a friday night.