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Was your car not driven for a few days before you started the car? That can also cause a rough idle that will clear up in few minutes. I had to drive mine around the block until it idle fine. If that is not the case then I would suspect the ICM also, a common problem with the 98 - 99 AEB engine. If it is bad then no, it is not covered under the 100K powertrain warranty but the oil cooler should be covered. Here's a link for testing the ICM, it's in the info forum:

http://www.clubb5.com/forums/viewtopic.php?t=66779&sid=c28e88707fbfc71566d74e25ed5a44dc
 
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