Piece together the eccentric inventor's diary entry about his latest failed experiment.

I clearly remember adding the blue chemical, but when the machine started smoking, I had to stop running the engine, and my assistant suggested using a fire extinguisher immediately.

I clearly remember adding the blue chemical, but when the machine started smoking, I had to stop running the engine, and my assistant suggested using a fire extinguisher immediately.

Remember doing something refers to a past memory (you did it, and now you remember it).

Stop doing something means to quit or cease an action in progress. (If you "stopped to run," it would mean you paused what you were doing in order to go for a jog!)

Suggest is always followed by the -ing form when directly followed by a verb.