car cranks but runs rough, shuts off when put in gear. what should I check?

1996 PONTIAC GRAND PRIX
100 MILES
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RPD96GRANDPRIX
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Problem started today. Don't know what to check, if its fuel or mechanical
Nov 27, 2011 at 8:16 PM
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JDL
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How long since a tune-up? Any applicable codes? If it idles rough, clean the throttle-body and idle air system.
Nov 27, 2011 at 8:51 PM