i really dont know either. how would someone go about doing this? are the 97 gts set up like my 03? with the COP? or distributer? cuz if its like distributer style then read on, if not then dissregard this post entirely
u prolly just chose the wrong spark plug wire. try another one. and it is in the same place. if u choose wrong wire, then u wont find the mark. try finding it in the day time with a lot of light, try using a flash light. shouldnt be too hard to find it. spout should be close to the distributer. (5.0 thinking here) but since u've done it on ur 5.0, then u prolly know as much as i do about the 97. goodluck