Timing chain should be fixed as you will get almost like a brand new vehicle. Mine was done in my home garage. Only the timing case needed opened but most of the things in and around there had to be removed to get there. It is the plastic piece on the main guide that breaks and slips. I replaced all 3 chains. main tensioner and all 3 guides. OEM parts cost me $250 online and found a good mechanic
on Craigslist who charged me $400. It runs like a new car very quiet. There is a class action law suit for this in CA. I would also, change both Camshaft Sensors and crank shaft sensors to see if the transmission like symptoms would go away. But YOU must use OEM sensors.