Hey Im having this issue with my 2016 is300 f-sport. Its misfiring mostly first start of the morning and is worse if the defroster is on. It seems to bog down mostly around 1,500-2,000 rpms. I previously had a p0174 and p1170 engine code a couple of weeks ago. Checked for vacuum leaks and found none. Did both upstream o2’s and it drove good for about a week. Now back to square one. The plugs and coils are new and ive tried a different maf and still nothing. Once it’s warmed up it seems to drive better. Any help is appreciated