What causes momentary hesitation when accelerator is depressed quickly. on 2003 Lexus GS430

I asked a question earlier about when driving my car and depressing the accelerator quickly there would be a lot of hesitation and I would have to back off of the gas. Then one day it started hesitating all the time, except when idling. I didn't have any codes, but you suggested it could be the MAF sensor. So I purchased MAF cleaner and cleaned the sensor and replaced the K&N air filter with a regular filter. This made a tremendous improvement. The only hesitation now is when out of gear and idling or when driving and gas is applied quickly there is a slight, momentary hesitation, but then the car runs smoothly. Should I clean the throttle body and if so, I would appreciate any pointers on doing this. Any other suggestions? Thank you!

Asked by for the 2003 Lexus GS430
Guess you didn't get it scanned, always people looking for the easy fix. Whatever.
1 more answer
clean the throttle bodys ,then try its.
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