Truck Repair: my chevy silverado trucks stalling while stop in drive position, vacuum leaks, throttle body injection

Question
Hello Mr. Van,
  my name is Romy Gallanosa and i owned a silverado trucks c1500 with 5.7 liter engine 2 wheel drive, im having a little bit of a problem with this stalling issue whenever im stopped and on drive position, it feels likes the engine starting to die or just about dying and its so annoying and i've check pretty much everything i know and it seems to be not helping, im getting so frustrated with not much money to spend on so im requesting a professional help from you.
                                 
                            Thank you,
                                Romy  

Answer
Hello Romy,
Testing the fuel pressure would be very high on my list.
You didn't say the year model, but if it has throttle body injection, it needs about 13 PSI to run good.
Another thing to work on is the EGR valve. Clean it, and make sure it is closing all the way.
Vacuum leaks are another thing to check for.

Van