03 vy lumina trouble codes after head re planed and valves done

[dcdec]

so i have done headset valves all gaskets new air intake water pupm thermostat and cleaned throttle body now i have had idle problems that sorted after intake clean the latest is the idler bearing is on its was it also has the troble code in the dash cluster 0000000000000000
1000000000000000

give or take a few 0 lol
and also when runing steam or gas white stuf coming from back left of engine and i noticed a spot of new colant mixed with oil on the bottom of gbox
heeeeelp me some one please