Hi GoldenStateSilverSport, It is one of the best articles i have read and very detailed with the clear images. Hats off to you. I did not see this article earlier, but I just worked on my 2009 Lexus Rx300 with only 98K miles on it. I had to take the air filter box out, throttle body, intake manifold to remove the rear Valve Cover so i could change the spark plugs, VCG and the PCV replacement, I cleaned the throttle body with a towel to remove grease out but did not do the steps you just showed as I am totally a newbie. but now i think i will take the throttle out again and clean all the parts with the carb cleaner and see if that helps.
I have a question. When i drive on the highway at 65 miles and over i feel the car is not smooth and needs more gas to get it running, the moment i take the feet off the accelarator, it slows down, did not have this issue before i took the manifold out or the throttle body out, am i missing something out here. it drives ok when i am below 40.
Idling in Park is at around 800 RPM, but if i drive and stop at the stop light, it misfires. there is no CEL whatsoever to figure out if i have a bad ignition coil. Like i said i changed all 6 plugs with NGK Iradium. but when in drive mode and at a Traffic Light the RPM goes down to 400-500RPM and then i can see some vibration on my steering or something like misfire.
Any help from anyone to bring this car to its original state will be appreciated. my email is mathewd23@yahoo.com
Thanks
Matt