Is it possible to have a bad injector or leaky injectors make u idle more rich or cause it to have flooding symptoms after not driving it for about 8 hours?

 

Yes. It is usually more symptomatic on warm starts though.

 

A stuck pintle will allow fuel to enter the engine as long as there is fuel pressure at the rail, that is, until all the fuel pressure bleeds off.

It really doesn't matter if the engine is hot or cold, what matters if there is pressure at the rail.

Sounds like it's time to get your injectors cleaned and balanced.