I am pretty sure the abstract noun form for bore is boredom :)
What u want really cause this isn’t making sense
Given information is not enough to answer your question appropriately. Let me start explaining with the cases that we can extract from given information:
Case 1: Stacy was driving the car - in this case, Stacy was in driver seat.
Case 2: Someone else was driving the car - in this case, Stacy was in passenger seat.