P0300, P0304, P0305

2000 Lexus RX 300 • 200 miles

I am getting P0300, and related specific cylinder codes. I replaced one coil initially, based on the code for that cylinder, but the other codes came on. I flushed the engine oil to desludge. We also used two fuel system cleaner. The codes cleared for a time with the engine flush but it did hesitate while driving. Now the the engine light is on (she is currently on the road) and I think that will turn out to be misfires. So is there
July 22, 2012.

Go to this walk thru link and then let me know

Jul 22, 2012.