what do trouble code 6122 and 6420 mean ?

1990 BUICK REATTA
170,000 MILES
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PJJACKSON567
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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
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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