Measuring speed with 2 PIR sensors

Other Hardware Sensors
9 
// First sensor
int led1Pin = 13;                // choose the pin for the LED
int pirSensor1 = 5;               // choose the input pin (for PIR sensor)
int pirState1 = LOW;             // we start, assuming no motion detected
int val1 = 0;                    // variable for reading the pin status

// Second Sensor
int led2Pin = 12;                // choose the pin for the LED
int pirSensor2 = 9;               // choose the input pin (for PIR sensor)
int pirState2 = LOW;             // we start, assuming no motion detected
int val2 = 0;                    // variable for reading the pin status

int led3Pin = 8;                // choose the pin for the LED
int loopStatus = 0;
unsigned long pir_time1 = 0;
unsigned long pir_time2 = 0;
unsigned long timeCalculation = 0;
unsigned long everyLoopTime = 0;
int pirSensorActiv = 0;
unsigned long timeBetweenSensors = 0;
int sensorState = 0;

// settings
unsigned long settings_sensorSkipTime = 3000;
unsigned long settings_mainLedDelay = 3000;
unsigned long settings_minimumDelay = 50;


volatile int start =0;
volatile int revs = 0;

void setup() {
  pinMode(led1Pin, OUTPUT);      // declare LED as output
  pinMode(led2Pin, OUTPUT);      // declare LED as output
  pinMode(led3Pin, OUTPUT);      // declare LED as output
  pinMode(pirSensor1, INPUT);     // declare sensor as input
  pinMode(pirSensor2, INPUT);     // declare sensor as input
  Serial.begin(9600);
}
void loop(){
  everyLoopTime = millis();
  // Checking first sensors state
  timeCalculation = everyLoopTime - pir_time1;
  // if time difference is greater than skip time, than turn on LED and count time
  if(timeCalculation > settings_sensorSkipTime){
     sensorState = digitalRead(pirSensor1);
     if(sensorState == HIGH){
        digitalWrite(led1Pin, HIGH);
        pir_time1 = millis();
        pirSensorActiv = pirSensorActiv + 1;
     }else{
         digitalWrite(led1Pin, LOW);
         pirSensorActiv = 0;
     }
  }else{
     sensorState = digitalRead(pirSensor1);
     if(sensorState == HIGH){
        digitalWrite(led1Pin, HIGH);
        pirSensorActiv = pirSensorActiv + 1;
     }else{
         digitalWrite(led1Pin, LOW);
         pirSensorActiv = 0;
     }
  }
  // Checking first sensors state
  timeCalculation  = 0;
  timeCalculation = everyLoopTime - pir_time2;
  // if time difference is greater than skip time, then turn on LED and count time
  if(timeCalculation > settings_sensorSkipTime){
     sensorState = 0;
     sensorState = digitalRead(pirSensor2);
     if(sensorState == HIGH){
        digitalWrite(led2Pin, HIGH);
        pir_time2 = millis();
        pirSensorActiv = pirSensorActiv + 1;
     }else{
         digitalWrite(led2Pin, LOW);
         pirSensorActiv = 0;
     }
  } else {
     sensorState = digitalRead(pirSensor2);
     if(sensorState == HIGH){
        digitalWrite(led2Pin, HIGH);
        pirSensorActiv = pirSensorActiv + 1;
     }else{
         digitalWrite(led2Pin, LOW);
         pirSensorActiv = 0;
     }
  }
  // Main LED
  // Both sensors has worked
  if(pirSensorActiv > 1){
    if(pir_time1 > pir_time2){ 
      // if PIR1 sensor was first
      timeBetweenSensors = pir_time1 - pir_time2;
    } else { 
      // if PIR2 sensor was first
      timeBetweenSensors = pir_time2 - pir_time1;
    }
    if(timeBetweenSensors > settings_minimumDelay && timeBetweenSensors != 3000){
        Serial.println(timeBetweenSensors);
        digitalWrite(led3Pin, HIGH);
        delay(settings_mainLedDelay);
    }
  } else {
    digitalWrite(led3Pin, LOW);
  }
}

I am getting some random outputs in serialprintin, but sometimes, they look like a real ones. Someone have ideas what I am doing wrong?