Probably build up of dust and lint inside cabinet. You need to unplug dryer, remove back panel and vacuum out lint. If excessive lint found, would indicate insufficient cleaning of lint filter or restricted outflow vent or hose. If odour is electrical smell or burning plastic check all electrical connections and insulators for signs of browning or overheating. Strong pungent smell could be motor winding overloading or burning out. Will need electrician.
Hello JoAnn Barrett - It is very rare for a dryer to produce a sour odor. I would suggest cleaning out the lint trap or try removing the panel to confirm that doesn't anything trap there that can cause this odor. Otherwise, I would strongly recommend contacting a professional to move forward accurately with the concern.
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