Welcome to AF!
The valve near the injectors is the shradder valve.
That is where you connect a gauge to test your fuel pressure.
Which I would suggest you do as it could be why you are having troubles.
The fuel pressure should be around 40-47 PSI.
If you havent changed the fuel fitler in the last 30-40K miles you should also do that, as it is recomended in those intervals.
Hope that helped,
Keep me posted what you find.