First I would start with a visual inspection under the hood, look over everything, vacuum lines, wiring, andything dirty clean it up. Look for anything that don't look right, and then if everything appears to be kosher i would go ahead and see if i could pull some codes from her. You could also maybe do a transmission oil pressure test. Another option since its a automatic, maybe something to do with torque converter. But start with the most obvious and do a visual inspection of everything.
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