Skipping 3-4 times on 2005 Ford Expedition

I had noticed before a skip going up small hill 3 or 4 times. I just recently had to get a new transmission. This was a problem before I got new transmission also. What would cause this? We also replaced the throttle body.

Asked by for the 2005 Ford Expedition
1 answer
Coil breaking down! Scan test needed to find which coil as there are eight total.