You've got a dead AC post on Tech forum. Are you certain the stumble is not caused by your compressor attempting to engage and failing?

I would cocentrate on the AC first and if when it is repaired if the stumble is still present look for a minor leak somewhere.

I dont see how the TC can damp engine vibration. You can test your MM by measuring them. There are two rims/rings at the top of each. The measurement from upper to lower rim should be between 17-13mm. Easiest way to measure is by feel using a 13mm bolt head or a socket who's outside dia fits inside your 13mm snugly. You can also lift the engine 1/4" and look down on them with a bright light and look for cracks. Dont lift more than 1/4" or YOU will crack them. If they've never been changed you might justt want to do them anyway. Makes a big difference.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)