1993 Chevy S-10 Knock sensor pigtail was broken

Truck has always run great till the starter went out. While replacing the starter it slipped and fell pulling the knock sensor wire which broke the pigtail connector. The kncok sensor on this truck is located right above the starter. Anyway since the pigtail was broken the truck downshifts into second gear, the brake light comes on and the speedometor jumps back and forth. This all happens at same time. I have had to shut the truck off for about 10 seconds then restart before it would drive normal again but it only last about a mile then happens again. We replaced the Knock sensor connector and the computer in the dash but it still does it. Any idea what happened when the connector broke and why it won't run right?