My 99 Tahoe is acting like it is running out of gas and stalling. I have done a complete tune up,replaced the TPS,Crank Sensor, EGR valve and the Fuel pressure sensor plus the fuel filter. I previously had someone put water in my fuel,I dropped the tank and got all the water out. I now have a locking gas cap. I am at a loss at what to do next to fix my Tahoe. I was told by a friend that it could be a possible fuel leak under the intake or my fuel injectors. How do I check the injectors? Also my check engine light is on, but the only code is for the fuel pressure sensor that I just put in. Any advice would be great appreciated.

 

sounds like a bad pump
What is the exact trouble code?
Have you measure the fuel pressure?