2005 STS4 1SG: GM Acc Lights, Corsa, Platnium Grille, Volant
So my ETC recently has devloped a rough idle at start up, if you give it gas for about 10-15 sec it clears right up. Its not plugs ive replaced them along with wires with a/c delco platniums. I dont THINK its the HG, it doesnt overheat, and theres only a small loss of coolant which i think is from the top hose, it has dex on it. To be safe today i added some Blue Devil, coolant sealer (if it is HG b.c is so minor im hoping this will solve it yuh i know its not likely) and on the way home it DID overheat but that was b.c it was low on coolant b.c the Blue Devil has you remove the thermostat and run the car for a bit before replaceing the thermostat. Anywho any other ideas on what else it could be causing this? I mean i doubt its the coils but ill replace them too if thats what others think it is. Thanks alot guys!