Whoops...missed your ground wire post there.
I agree with 99rx.
Start by hooking that up since a bunch of electrical components used that wire as a ground point.
The photo I provided is showing that "EC" is the ground wire that you missed.

 

oh man, I hope that fixes the problem. Where in the world did you find that diagram? I really appreciate it.

 

Ya, everything originates back to that ground. It's the wire that could cure everything. Lol!

 

hooked up that ground, and everything is fixed!! now, I think I need to clean the IACV now because it has been hesitating occasionally when you take off from idle, even before I messed with any of this other stuff. thanks for all the help.

 

99rx,
Where is this ground located?
In the engine compartment?
It should be easy enough to locate with all the wires running to it.
I want to check mine and make sure it's clean and tight.
Thank's

 

its on the back side of the intake plenum. you cannot see it, you can only feel it. it is ont he left side, its a 10 mm bolt.

 

phil128605
Thanks for your response.
I'll go see if I can feel the ground back there
Again, it should be easy to locate it with all the wires running to it. It has to be the only kind of connection like that back there.
Trust Lexus to put it an almost impossible location. I hope I can get a wrench on it.

 

no problem. i used a gearwrench. probably the best tool investment ive made.

 

the problem is u forgot 2 put the ground wire back that hooks 2 the back of the pentium, u can't see the wire its not the ground wire on the left its the one behind the pentium that feeds into the harness thats just above the rear valve cover thats the ground 4 the tranny electronic shifters with out it the trans shifts out of 1 late and will not hold 2-3 with out tring 2 jump out or jerking i know i had the same problem its not ur plugs or valcum its just a missing ground replace the ground save a few hundred bucks. got it fella's

 

On target gentlemen. Mine was connected but loose. Tightened now, problem solved.

 

This forum rocks!

 

OK, exactly what is a pentium.

 

I think he meant plenum.

 

Thanks hypervish, but i'm still confused as to what it is and i know once i find out i'm going to feel dumb, and is there another way to get to the ground wire.

 

mno221,
Two ground wires are bolted to the back of the plenum (top center rear of engine, under the wiper box). Requires a 10MM wrench and agile hands. Reach between the plenum and wiper box (while engine is cool) and you can feel the grounds. They are bolted tight to the plenum, finger length distance from the top.
It's a bit of work, but you could pull the hood and wiper box out; then you can actually see the grounds and connection.