what do trouble code 6122 and 6420 mean ?

1990 BUICK REATTA
170,000 MILES
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car turns over but will not start and acts like it has no spark.
Sep 17, 2012 at 4:15 AM
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KHLOW2008
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Where and how did you get the codes? Our database does not have any reference to these codes.
Sep 17, 2012 at 5:06 AM