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What is your question?
what causes the engine to retain high idling after initial startup? (but not a rough idle)
How long has your 2003 Cadillac DeVille had this problem?
a few weeks
1 Reply
In very cold climates its normal for the engine to idle at a higher rpm in order to warm up the catalytic converter. If it stays there after its at operating temperature you could have a vacuum leak. Alex