Ok, while changing injectors and removing fuel rail. I had to remove the thermostat housing because I didnt see anyway around it. I had partially removed the rail to the point where the injectrs O ring was out the wholes but resting on the outer rim of the wholes. When I removes the t-stat housing I believe I may have gotten coolant down in the wholes. I know, I know, stupid does not begin to describe it. No matter its done, so when I strated her up, she Idling a hell of a lot better with the new injectors, smooth as you know what. However I kinda forgot about the stupid thing I did and noticed smoke coming from the exaust right form the area of the O2 sensor, then it dawned on me what that was. So my question is do I drain the oil and flush it somehow. Drainning oil no problem how do I do a proper flush if possible.