steppermotor with big easy stepper shield and accelstepper library

The speed and accel/deaccel is set under void setup:

void setup() {                

  stepper.setMaxSpeed(6000);
  stepper.setAcceleration(1000);

When i remove the trigger rules and remove the code that repeats it 4 times the stepper is rotating 90 degrees (using acceleration en deacceleration)

void loop()  
{ 

// for(int shot = 0; shot < TotalShots; shot++)
    {  
       {
//         stepper.setCurrentPosition(0); 
         stepper.moveTo(pos);   
         stepper.run();
       }                    
//    delay(1000);  
//    digitalWrite(SHUTTER_PIN, LOW);
//    delay(2000);  // take shot
//    digitalWrite(SHUTTER_PIN, HIGH);
   } 

// while(true) {} // execution does not proceed past this point  

}