Mark klesnik

Hi i just completed a long trip. And now when i start the car while its cold and when i change gears it loses power but doesnt die. Have to sit my foot on full accelleration for 5 sections before it gains power again but constantly does this until the engine warms up. Then thr check engine light turns on and it doesnt do it anymore its perfectly fine.. but the check engine light is on.. im thinking its a sensor? Any help would be greatful. Honda civic 5 speed manual 2000 hatch back vi