My 01 CamaroSS SLP (39k) won't start, no spark. If I plug my OBTII tool in (no codes) and hit erase sometimes it will start and drive perfectly. I think that rules out crank and cam sensors. Its not a drivability but a starting problem. I believe even though there are no codes present, by hitting erase it does a power on reset (POR) to the PCM which would lead me to believe it might be the PCM. Tough to troubleshoot this new stuff.