I have a 2005 TB and when I ride under A/C for a few miles, I get now acceleration, and feels like transmission is slipping. When not using A/C has no problems.
If the engines stumbles at idle when the AC is on, but runs smooth when it's off, the throttle body needs to be cleaned and the PCM reset. Many, many threads on here about this problem....do a search of throttle body.
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