Help with 2002 GMC Sierra Denali, we drove the vehicle parked it and then it would crank but die again fuel pressure is 60 psi, changed spark plugs, fuel filter and noticed the security light is on.

Have you confirmed that its not a security issue? Did it die suddenly or was it bogging out for a while? Have you scanned the engine?

the truck's probably been disabled by the security system. that may involve a trip to a dealer to set right.

The security, antitheft or lock picture/icon is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. This link explains it pretty well.
http://www.diy-gm-security.com/
http://newrockies.com/

the first thing is check your fuel pressure for the right psi. some vehicles will not start if the pressure is off only by a couple psi. your particular van is epuipped with a injector module assembly under the upper intake manifold. commonly called a injector spider. those are notorious for leaking and will keep a vehicle from starting. also while your checking your spark how did you do it? if the spark was any color but blue it is too weak of a spark and the vehicle will not start with that. this could be worn plugs, wires or weak coil.

Start with the simple and replace the fuel filter. The fuel filter may have reached the end of it's life time and is dirty causing the issues you have. The worst is the fuel pump it self has gone bad and needs to be replaced, the fuel pump should be producing 62 to 65 PSI when the engine is started and should drop no more then 5 PSI when the engine is running. You can check the fuel pressure at the shredder valve with a fuel pressure gauge. Good luck and keep me posted, be glad to help get your Yukon running 100% again.

Do you still have fuel pump pressure?Is there fuel getting to the cylinders?If all the fuses are good,then replace the crankshaft sensor.

that has a votec engine in it the fuel pressure is droping at knight and it takes 60 psi before the injectors will fire most likely cause fuel pump ,leaking injector ,or a feul pressure regulator

U NEED TO CK THE FUEL PRESSURE 55 TO 62 PSI.IT CAN LOOK LIKE U HAVE FUEL.IT MAY NOT BE ENOUGH.IF U HAVE LOW PRESSURE CK THE FUEL FILTER BEFORE U CHANGE THE PUMP

You need to find out if you have enough fuel pressure, and if you have injector pulse. A noid light is a simple kind of test light that you can get at a parts house to test injector pulse. Unplug an injector and plug the noid light into the harness. Have someone crank the engine, if it flashes then your injectors are firing. Check all the fuses under the hood. You should have 55 to 60 psi fuel pressure.

Just having fuel is not enough on this engine, here are the spec's. Even 1 psi out of spec can cause a no start.

Fuel Pressure
Pressure 1 (PSI) Pressure 2 (PSI) Pressure 3 (PSI) Range Note Range Note Range Note 60.0 - 66.0 Y131 50.0 - 63.0 Y132 66.0 Y133 Y131: System pressure with ignition on (PSI).
Y132: System pressure while idling (PSI).
Y133: Fuel pump pressure (PSI) with return line briefly restricted.