when i measure resistance on injectors it starts from 150+ and in half a second drops to 1

what im doing wrong?

@AsenM you are using an multimeter that expects an pure ohmical resistance to measure the resistance of an inductor.

I'd either use an lrc meter or apply a carefully chosen dc and measure the voltage drop. You definitely need to limit the current through the inductor.

An explanation about the multimeter: those digital multimeters adjust the tension on the test leads: if the resistance is low, it needs less tension. If the resistance is high it needs more tension. Sadly an inductor reacts on changing currents by changing the voltage drop, making it impossible to measure something meaningful