rapid fuel pressure drop

when people talk about fuel pressure tests, what would they consider rapid drop? i did the prime test(KOEO) and it read about 42psi, then i turned key off and it slowly started to drop. I thought it was suppose to hold for awhile? Im beginning to think its a leaky injector because of the slow drop? Is there any way to fix a leaky injector besides replacing it???

A good cleaning will often stop injectors from leaking. RC Engineering offers this service. But is usually cheaper to just buy a new one, unless you have some high-end injectors. From their FAQ:

I don’t need high flow injectors, can you service my injectors?

Yes. Injectors over time will develop deposits inside the injector preventing it from functioning properly. Our service will attempt to solve all of the problems typically associated with worn injectors. This includes stopping any drips/leaks, uniform spray patterns and flow rates to within 2-3%. This is accomplished with our ultrasonic cleaning process as well as a high flow reverse flushing. O-rings, filters and pintle caps are replaced. A full, before and after, calibration report is also provided for your convenience.

http://www.rceng.com/

It doesn't take a "slow stream" of fuel to cause the pressure to drop rapidly. Liquids are incompressible. It only takes a few drop of leakage to drop the pressure to "0". After those first few drops, it isn't going to leak any more, because there is no pressure left.