2005 Ford Thunderbird 3.9 V8 (actually Jagure engine also used Lincolns)

I have an intermittent miss and a code P2107 & P2110. This indicates a bad throttle actuator control (TAC) and the need to replace a rather expensive throttle body. However, I have found several references that these codes are more often set by a bad coil on plug (COP). Anyone have any experience with this?