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Received DTC code #PO430 approx. month ago-car ran horribly. Have not driven since then until this week. Now Mil light not lit but problem still present. Very rough idle upon startup with major misfire-seems to get better if I get R's up but still misfires on acceleration. Am I looking for upstream O2 sensor failure, catalytic converter problem, or could it be something w/ idle air control,MAF, throttle position sensor, etc. Any help would be greatly appreciated. Thanks!!
 
G

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Looking on the service CD, the 0430 may simply be caused by the misfire. It's basically telling you that the bank 2 converter is operating below threshold limits. Not much to go on at this point, I would start looking into the basics of why it's misfiring.

There's no other codes?
 
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