Looking for any ideas. In need of help. Out of the blue developed a strange idle. See video. Stays idling and drives perfectly fine until you are in motion and coast in which case it dies. I changed ignition components, tried several IAC's, couldn't locate any vacuum leaks. Seems to be worse when engine is warm. ECT sensor is new. Fuel filter is new. Any ideas? It's almost like it can't get good fuel stream at idle but it drives strong when on the accelerator.