Ok so i got off work on wednsday and pulled up at EZ-mart to get a drink and go back out and get in my 92 lude Si and start it up and then just suddenlly the rpms drop and car dies???....tried to start her pu again but it wouldent fire up....and then i jus waited for about 3 minutes and then started her up with no problem..and previously that morning i pulled out code 23 which is knock sensor...would that be my problem or my main relay??? thanks guys

 

Might be the ignition switch, main relay, ignitor, etc. The knock sensor will not keep the engine from starting or running.