1993 Chevy Blazer error code

1993 CHEVROLET BLAZER
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MCDUNK
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1993 Chevy Blazer 6 cyl Two Wheel Drive

I have a 1993 two wheel drive chevy blazer with the 4.3 liter engine iam getting a code 23 what does this code indicate whats the problem is
Mar 7, 2010 at 12:45 PM
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