My LS430 is a 2002 with aver 244K miles on it. I bought it from a friend because it was sitting at a dealership waiting to get new coils put in. I am pretty handy with cars so I bought the car cheap and took it home to do the work myself. It turns out the car had been sitting for over 5 months, so the gas was also bad and the oil was leaking from several places. I replaced the coils, plugs, injectors, battery, MAF, VVT solenoids, and TPS. The car ran rough, but it started getting better and better as I drove it. Soon, the EVAP system three codes, and I had to cut a hole in my trunk to get to it (I spent 5 days trying to pull the axle out to no avail. Too much stuff was jammed up or seized). After that, I started getting random codes here and there every once in awhile, getting more and more frequent. So I bought a refurbished computer from an online site and they “programmed it to my VIN” and mailed it to me. Since then my TPS, cam sensor, and crankshaft sensor have all stopped working and I had to replace all of them. Now my car won’t go past 1500 rpm and it has a very rough idle and a random squeal. I did put my original computer back in because the ordered one didn’t even start my car. I also added a new grounding kit to make sure it wasn’t a grounding issue. Any help at all would be appreciated.