How long since a tune-up? Any applicable trouble codes? If you have the spider fuel system, that system is noted for problems. I have seen service bulletins with this system, problem with cold start up. After the first start-up, the vehicle may run fine the rest of the day. The problem was fuel poppets sticking. The fix was to clean the fuel poppets, the cleaning procedure I saw was a shop procedure.
Generally, with misfire, check spark--fuel--compression.
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Bad miss at idle?
http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html
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While stop engine idles
like cylinder missing?
http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
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Engine Misfire codes for
car?
http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
Engine Misfire codes?
http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
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Misfire on cylinder 4?
http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html
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Oil on spark plugs and car misfires?
http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html
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This will help.
Thanks.
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