Ok background 08 LS with 132000k on the odometer bought on Friday for a fair price base model no abs, manual windows and doors automatic transmission. Ran like a dream started up at test drive and drove it like I stole it for at least 30 minutes brought a scan tool with live data recording found no codes no abnormalities to speak of. 14 hours later of rain went to drive and got a crank no start with a flashing check engine light and the main relay constantly clicking. Replaced plugs and writes just to eliminate any thing there. No spark no fuel pump activity found a bad resistor for the engine air waiting for the local Chevy dealer to get one in stock but i am 100% baffled this car ran too well for a major issue to have developed sitting still in the rain. Ground from the pdc was corroded and have fixed but still the constant clicking of the main relay and the cruise light is flashing with a pedal hit. I've power probed millimetered and scanned with no possible culprits any ideas would be greatly appreciated. Thanks in advance