VSC + TRAC OFF + Engine lights come on + code P0328

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3 weeks ago bought this car in old car dealer w/ 138k miles. the VSC, Trac Off, Engine lights come on. OBD code is P0328. When happen, car runs ok in driving, and engine runs ok as open hood in checking, but feel rattles badly inside of car when in idle waiting traffic light. So gear to N in waiting to reduce rattling. >_< Technician cut a cracked vac. hose end and fixed the issue. But issue come back later. Then tie vac. hose w/ cable ties. Issue back also. Tried gas cap too. Need grease to seal gas cap tight? Looks like VSC + Trac off come on first, then Engine...