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Have felt this 3 times in last 2 weeks so figured I'd ask the experts. At idle the car almost feels like it is going to shut off (I never can see the RPM's fast enough) - it makes me think the RPM's are dipping and the computer catches it and pushes them back up. Has happened in Park and in Drive while sitting at a stop light. The first time I had just started the car and attributed it to a "cold" start (although it's still 90 degrees here in FL). Now that it has happened a couple more times I'm thinking something is going on.