05 PT cruiser convertible 2.4 turbo at my wits end

All this trouble just started last January. I started the car. It was billowing white smoke changed turbos still had the white smoke problem and then it started missing backfiring and falling on its face just like it ran out of gas but if I matched the accelerator, it would take offand then it was down to running on three cylinders. I had it to the shop twice over $500 problem not cured. Vacuum leaks were fixed.
So this is what my dad has done to this car so far !! all the sensors have been replaced, 02 Mine has both upstream and downstream, Map sensor PVC, EGR except the cam & crank and all grounds have been cleaned new ignition coil new plugs, new wires the new coil fixed the dead cylinder. I just didn’t know what to do the thing about it. When it falls on its face it doesn’t do it the same every time I Isn’t like it starts up you drive a block it happens. It may not happen an entire day or it’ll happen two or three times and it’s not a safe situation. I can’t imagine the computer needing replaced and even if I got a used one, you have to take it to Chrysler to have it programmed. I had a heart attack. I’m not on disability yet and I don’t have the money, but I gotta have a car to get to my Dr appts dad‘s been taking me but he’s 85. I need help. I need a Chrysler mechanic give me information. Thank you so much.