Hi all. I've recently purchased a 96 cobra after owning a 95 and wonder if this is normal and if not what should I look for to repair. After driving and coming to a stop the car idles at 1800 rpm for 5-10 seconds and drops down to 800. It also idles like this after the initial starting of the motor. Is it normal for these 4.6 to idle high like this? Thanks!