2005 Ford Escape

What is your question?

What does it mean when the four-wheel-drive light flashes on the dash and I change the Cora pack and I still have no power it runs and idols fine what can I do

What makes this problem better or worse?

Idols fine start fine just misfires you start driving it it will not go over 20 miles an hour without a hesitation

How long has your 2005 Ford Escape had this problem?

After it got a new muffler For inspection