Jeep Cherokee Laredo 2012 engine malfunction

For sale Jeep Cherokee Laredo 2012, mileage 350,000, inspection is new and registration is new, body has been repainted cosmetically, airbag and chassis are intact, transmission is excellent, full AC, has screen and camera. Flaws: engine has a problem, makes noise and cuts off partially; some mechanical parts say it's the timing chain, others say it's a cleaning issue, conflicting opinions, engine was previously repaired. The car is six-cylinder, standing by the line, no quarter panel issues, for sale