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Cadillac
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Discussion Starter #1
i have a 2002 cadillac deville and for a while now i have been having a bad rough idle and the acceleration is less than perfect.... short and sweet my question is that what is the economical way to test the issue accurately and a good online store to buy the coil packs if needed... Thanks
 

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2010 DTS
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87,580 Posts
Before you buy anything do a search for plenum and check that. While you're there, clean the TB.
 

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1997 Seville STS, 2000 Seville STS
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1,694 Posts
If you had a bad coil pack chances are you would have an SES light on and a P0300 misfire code in your current DTCs. Pull your DTCs to find out what the car thinks is the issue. P0300 by itself, probably a coil pack, or plugs or plug boots, P0171 or 0174 with or without a P0300 means vacuum leak and probably a split plenum boot.
 
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