I just bought a 1985 Buick LeSabre. It has a 5.0 v8. When I bought it from my computer worker it had the battery dissected. He brought it to the yard and stored it there for about 3weeks. It has Ben sitting since 2015. Anyways soon as I connected the battery the check engine light was on instantly. I went to check the obd1 port and there was no power. I found a blown fuse. When I put the new fuse in the port the computer started smoking. So I disconnected it. The car runs the same without the computer plugged in at all. Is that normal? It has a slight misfire and slight shake at idal. Check engine light doesn't do nothing different either.