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many early 90's gm cars the computer is reset auto what you want it to do is learn it's idle . you may try to put car in drive with all electrical devices turned off apply park brake and chock wheels so car will not move now just sit there and wait with car running in drive until the electric fan turns on this can take as long as 20 minutes.. when fan turns on it has cycled and should have learned it's new idle...note it has taken me as many as three times for it to catch...turn car off and restart and see if your idle has smoothed out .. this is common when disconnecting the battery.. now i plug in an outside power source in to the lighter to have computer hold it's memory

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15y ago
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Q: How do you reset the security device for a 1993 Chevy Lumina?
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