1990 2.5 dead

I have a 1990 2.5 Caravan and I am getting on fuel, no spark, and no dash lights. the only thing I get is light and the radio. But the engine does crank. Computer was replaced but may be a bad new computer. Everything is checked that I know to check, but I have heard something about a spec going out, but I have not heard of it. Any ideas. Thanks for any help