jesslexus

Hello & thank you in advance!

I have owned my 99 es300 for 7 years it has 210k and has been a great car with relatively minor repairs.

I recently replaced both knock sensors the harness, both ocv valves and valve cover gaskets, this was all done last week, only thing I had trouble with were the injectors i didn't coat the new o'rings in oil and i messed them up installing them and had to take the upper plenum back off install new o rings correctly & put it back together, it ran great again the ce light did come back on but it had been on well before and no noticeable drivability issues it was throwing p1135 code and I didn't worry about it. the knock senors and ocv were causing me very noticeable issues.
Today i start the car notice its idling a little rough when I take off it spits and pops off and of cuts in and out, newest code is p0300 it ran fine for days after the work could this be related? also threw p0125 which is a new one but from what I read it would cause driveability issues, I just want to pull another 50k out of the car before I sell it and upgrade.

Thanks for your help.