One of the things I have been taught is that once you believe you should perform a power off forced landing, it is best to commit to that, and don't change a decent plan. It's difficult to think that you are about to risk an off airport landing in a "good" plane, but committing to that may save your life. It has happened that a Pilot has been gliding down to a reasonable prospect of a landing, to have the engine momentarily spark to life. They have changed their plan to attempt a continued flight. Then the engine quits for good, and their possible landing is no longer possible, and there is no new plan. Some instructors teach that once you have decided to glide down, pull the mixture, to be sure it stays quit, and you continue to the planned landing.