2007 Chevy Suburban
-Came into shop for an engine due to low oil pressure, customer supplied gm crate motor that did not include oil level sensor, installed engine and changed dtc reports on oil level pids. Wrote pcm and no start condition appeared. I have communication with module, no codes, intermittently will crank and even start for 2 seconds or so and then dies and will not crank again. crank signal pid appears as yes, and starter relay pid does not when condition is present, im honestly stumped does this have something to do with my tune? or another issue it just does not make sense how there is communication with all modules, no error codes, or security issues "as far as my data shows".
any help would be welcomed as this is a customer vehicle thanks guys, Jules from Rutila Customz