If you notice the car running rich(black smoke out of the exhaust) you might look at the MAP sensor. It is a common problem with these cars,and about 50 bucks at your local parts store. You will find it on the passenger side inner fender just in front of the strut tower, it is a small black box with one vaccum line and one elec. plug. try pulling off the vac. line and plugging it with a bolt the car should idle like that, if it does, you have found your problem. Hope this helps
Your EGR valve coked up , causing exhaust gas leak to by the valve into intake manifold at idle. It cause engine idle very rough. EGR operates above idle only , to control NOX. The fix is to replace the egr valve or fab'd metal plate to cover the port on the intake manifold. also remember plug the vacuum line. I've done this on two vehicle I own with no problems. Good Luck
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