1992 Lexus ES 300 smoke coming from exhaust

1992 Lexus ES 300 6 cyl Automatic 215000 miles

I recently replaced a rear fuel injector, all spark plugs, a purge valve sensor and EGR valve and hoses. One week later, I have a whitish smoke come from the exhaust. After sitting for long periods of time, on acceleration, the car seems to stutter almost. One the engine is warm it runs fine. I feel that while driving the smoke looks bluish in color. There is no stuttering while idling and there seems to be no coolant loss and no milky color in the oil. What could be the cause of the smoke?