1993 Chevy S-10 timing belt

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?

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.

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)

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.

Have you checked the fuel pressure and the fuel regulator?

Here's a video on how to test....

http://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm

Were is the test port and the pressure regulater located?

What is the correct pressure for my blazer

The test port is on the left rear of the intake.

Fuel Pressure:

4.3 Vin W (8TH DIGIT OF VIN) - 55- 61 PSI

4.3 Vin Z Torbo - 38 - 43

Here is a pic of were the Regulator is....

You will have to remove the Plenum to get to it.

I'll give this a try and get back to you thanks