07 Dodge Dakota intermittent engins stumble

3.7 engine Occasionally, when driving at a constant speed, there will be a split second loss of power (stumble) then continues on as if nothing has happened.
Plugs have been changed (was happening before the plug change), now at 38K miles. Seems to happen more at low speed in damp weather. No codes are set. Any ideas?
Thank you.
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