Deodiaus wrote:
I have a TroyBilt powerwasher with the Briggs & Stratton engine I
bought at Lowe's a couple of months ago.
It has oil, but seems to run while emitting a white cloudy smoke. If
I don't have it high enough on the throttle, it dies.

Most all small engines are made to operate at 2 speeds, idle and full
throttle. Don't try to run it in between.