1. I took my injector apart, it had bits of plastic stuck inside the injector wall.
2. I sprayed carb cleaner inside the cylinder.**DO NOT SPRAY CARB CLEANER ON THE O'RINGS**
3. Then used my air compressor and blew out the small pieces of plastic stuck to the inside wall.
4. Afterwards I put a blue shop rag into the injector and pushed it through several times removing the remainder of the gunk.
5. I removed the o'rings, had some plastic underneath those too. Used an old soft bristle tooth brush on all the threaded parts and the o'ring seats.
6. Spray carb cleaner on a rag and wipe down all pieces.
7. Once the carb cleaner had evaporated and all pieces were clean a dry, reassemble injector.
8. My injector has a vent hole on the plunger end. Pushed plunger all the way forward.
9. Spray "CRC Heavy Duty Silicone" with provide straw into the injector. Can also be used on o'rings. It's heat resistant to 400 degrees.
10. Injector now works like it did the day I bought it, maybe better.