honestly?

you need to get the focus correct on the camera before you post any more blury pics up

i'm sure we can help you but first we need to see what engine it's got fitted to it and on that age of sierra it may have a cat fitted so it will have different wiring (the cat cars came with coil packs in some cases) so it's all a bit up in the air until we see a pic of your coil if it's the standard one or the coil packs (if it's got them fitted)

don't mean to sound harsh, just it is