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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
Coil breaking down! Scan test needed to find which coil as there are eight total.