So this past weekend, I went to drive the 89 Cougar that my uncle gave me home. I had a little trouble getting it going because of a bad coil wire, but I took care of that. I started to drive up the road, and it wouldn't shift out of first. I held it at about 50 km/h for a bit, hoping maybe it would shift eventually, but no luck. I don't know why it's doing this now, just two weeks ago when I had it out, it shifted perfectly. Maybe a fluid and filter change will help?