That damm Tempo

1993 ford tempo. I dorve to work with the car missfiering after every bump. Took a look to find number 2 cylinder plug wire loose. Boot came off end. I reattached wire and slide boot down. Went to start and it did run for 2 sec then died. After that I have no power to anything exept the oil light and check engine light. These wont even turn off wih key out. The temp gauge did go off the charts with the key on engine off but then would go down after the car was on. Ive herd of ect sensors being bad would then put ur fuel maps off allowing the car not to start. Also idles very high when it starts then comes down some times other time not. I get no response from the key in any position. No head lights. No trunk pop when button pushed no radio no automatic seat belt nothin. Thanks for your help