Engine lite came on. Diagnosed as gas cap leak,evap leak or knock sensor. We on 2002 Kia Spectra

replaced the sensor. We were told to disconnect the battery which we did. After we were done we reconnected the battery but the alarm kept going off. We got the alarm off with the remote but now the engine won't turn over. We can jump start the starter and it will start up but once turned off it won't start again. I'm really discusted cause my daughter has cancer and we need this car in working condition to get it emmissioned and inspected so I can take her to her appointments.

Asked by for the 2002 Kia Spectra