Your idle speed is controlled by the engine control module. Check your
underhood label for the idle specification. It should say. 880 seems a
little high to me.
Furthermore, if this were caused by improper idle, I'd expect the code to
return more than cylinder number three because an issue caused by an idle
problem should affect all cylinders equally. If you're vehicle is idling
too low, chances are that it's *caused by* the misfire, not the *cause of*