I've been waiting for the latest codes to be posted. Like 7milesout said, use what you got to figure out why the cel is on. Guessing doesn't work very well.
As for led lights, the brake/tail light bulbs are the ones that will cause problems. Even if one or both brake lights are oem non-led but are burnt out they can cause problems, usually abs and brake warning lights and sometimes cause no throttle fun times.
As for popping through the exhaust, that is odd. Did it do this right only on first startup after it was flooded?
Starting from the beginning... Did you pull the spark plugs out when it was initially flooded?
ObdII port is loose and wobbly. It's fine. That won't make it run like pooh. Check for codes without the engine running. The abs and trac lights come on when I use my scanner and start the car. I don't remember if they come on with the engine off/key on? Nothing to loose sleep over but I probably wouldn't drive around with your device plugged in but checking codes is fine.
Mirage videos:
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)