Okay. So, my 2001 IS200 had the common problem of the Eng, and TRC control flashing about a week ago. I took it and got the engine codes read and it said the number 1, 3 and 5 cylinders were misfiring. Long story short. I read all over this forum and see ppl have a common problem with the coil packs. I swapped the coil packs from 1, 3, and 5 to the other three. The problem didnt move. So i was thinking it was the injectors. I got 6 used coil packs and 4 used injectors from a scrap yard. I changed the 1,3 and 5 coil packs first since it's the easiest. I reset the engine codes and it fixed it for two days. It drove like a champ. (I also changed all 6 spark plugs with 6 new ones) Today the same problem came back. I have not gotten the codes read again but did change the other 3 coil packs with 3 more used ones on the 2, 4, and 6 cylinders and reset the codes. No fix this time. Right away it failed. Any suggestions?