Here is a simple guide for the steps one should take to try to resolve your problems.
1. Update to latest version
Emulators can have stable builds that are weeks, months, and sometimes even years old. The "stable" version is often times just a randomly picked dev version. That is why the latest dev versions should be preferred. This could solve emulation issues most of the time. Links to dev builds can be found at the pages for PCSX-R, PCSX2, Dolphin, nullDC, DeSmuME and PPSSPP.
2. Change Settings
If you're using a plugin based emulator, graphical glitches and sound issues might be solved by changing the settings.
3. Review these FAQs:
4. Check for known issues
There are resources available for emulators which lists the common known issues with games, and the solutions.
5. Check the archives
Sometimes, questions may have been asked and answered multiple times in the past. Check the Emulation General archives.
6. Ask Emulation General
If you still can't find a solution, ask Emulation General. Provide relevant details such as:
- System specs, especially CPU
- Emulator and version
- Emulator settings/plugins
- Game details
- The problem itself. Do not forget that, because if you do then what comes out makes no sense whatsoever.