Get the codes! Hook up an OBD2 scanner and see what codes it's showing. On first description it sounds like a MAF (mass airflow) sensor with the p/n 22204-22010. It's around $140 and is a very simple DIY. I'm sure there's many threads of cleaning them or changing them. Only tool needed is a small phillips screwdriver. You can try cleaning the sensor ONLY with MAF sensor cleaning spray. All literature says to stay away from using cleaners such as carb cleaner, brake cleaner, throttle body cleaner, etc!

Did the code (check engine light) come on after she started missing/stalling badly or did the code come first, and then you experienced the stalling, or did they happen at the same time?

Edit--- $65 for OEM Denso on RockAuto

 

It sounds like the problem I had with my 01 ls430 which the car would just bog when trying to accelerate or kickdown. Under light throttle it was fine though, and my car didn't throw any cel. Cleaning the maf sensor helped a lot, although the car still sometimes feel like it would stutter a little say when I am going up a hill with the gear selector in 3 and I gradually increase the throttle beyond 50%, misfire maybe? I didn't manage to remove the maf sensor from the housing to clean it though cos the screws were starting to strip so I just removed the air filter housing and cleaned the maf sensor that way. Hope this helps.

 

 

Check transmission fluid levels just in case. There may be a leak somewhere. Hopefully that's not the issue but can never be too sure.

My last car did that. It had begun to leak and going uphill in the mountains was a struggle until it was fixed. Pressing the accelerator all the way would cause it to decelerate actually. Eventually it lost enough fluid that it would skip when accelerating off the line.

 

Clean Mass Airflow Sensor
Replace Air Filter/Clean

Could be a failing fuel pump

Need the codes to see what else is happening.

When I get a hesitation in the pedal, I turn the key on (do not start) then slowly press and release the gas pedal 5 times. Slow all the way down. Slow all the way up. Then turn the car off.

This calibrates the Pedal Position Sensor. If I feel a little hesitation, I do this and it has been working.

 

I've been running down an issue on my GS and based on the symptoms you've described it could be the Throttle Position Sensor. Like others have said you need the codes to narrow it down. I just picked up a highly rated code reader off of Amazon for $35. Keeps me from having to go to the auto store just to read codes and I can use it on any of my family or friends cars.

 

 

NICE! Who did the repair, and what/where did you source the parts and for what cost? (I ask a lot of questions, can't you tell? )

 

 

 

you have to change the brake wear sensor wire,its a wire that breaks when you wear down your brakes..

 

https://www.clublexus.com/forums/ls-...ar-sensor.html

 

When you install the new ones plug them in but zip tie them to the knuckle instead of putting them back on the brake pad, so you wont have to replace them again.