Your truck won't start if Belt Broke or Jumped Timing. However, you vehicle has a chain not a belt. So, if it jumped timing it won't start and it would backfire.
Have you check to make sure you have fuel getting to the injectors and spark to the plugs?
Also check the Cap and Rotor. When was the last Tune Up?
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Thursday, July 3rd, 2008 AT 9:25 PM
BIGBLUE
MEMBER
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CHANGED SPARK PLUGS, WIRES, DISTRIBUTER CAP AND ROTOR ABOUT 6 WEEKS AGO, HAS NEW PUMP, FILTER, MAP SENSOR, THROTTLE SENSOR, WILL START SOMETIMES AND IDLE BUT STILL UNDRIVEABLE.
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Friday, July 4th, 2008 AT 6:25 AM
OBXAUTOMEDIC
MECHANIC
3,711 POSTS
Can you describe what the vehicle is doing when trying to drive it.
Is the check engine light on? If so have codes pulled, auto zone will do it for free.
I could possibly be either the Idle Air Control Valve (IAC) or the Manifold Absolute Pressure Sensor (MAP)
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Friday, July 4th, 2008 AT 11:26 AM
BIGBLUE
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IT WILL IDLE AND WHEN I HIT THE GAS HARD IT WILL SPUTTER AND THE DIE OUT, SOMETIMES IT WILL START BACK UP SOMETIMES IT WILL NOT, CHANGED IDLE AIR CONTROL AND MAP ALREADY.
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Saturday, July 5th, 2008 AT 5:14 PM
OBXAUTOMEDIC
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Have you checked the fuel pressure and the fuel regulator?