I have a 2000 Ford Taurus flex fuel, and when ever I start the car when it sits over night or day cold or hot it holds idle over 2000 rpm for a few seconds then drops down to about 1500 for a few then slowly down to under a 1000, it also has a slight misfiire and a somewhat loss of power, I have replaced the plugs and wires, the coil pack, IAC valve pcv valve the throttle position sensor and that throttle position sensor connector and the problem is still there