Ok im having a problem with my air conditioning unit under the hood... ive been noticin a clicking for awhile now while im driving and when it clicks my car doesnt really stumble but you notice the click affecting the motor.. then itll click again... then still drivin click and stumble again.. itll do that the whole time im driving no matter where.. AC is turned off inside the car.. is there a sensor causing this problem? visual check confirmed its the ac making the noise so.. any help would be great thanks.