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2003 Lexus GS430 Questions

Get answers to questions about your 2003 Lexus GS430 at RepairPal. Find solutions, diagnose problems and get back on the road.

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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!

At first my car would hesitate when cruising along and I would have to accelerate quickly, but all of a sudden it does it now when just starting out slowly. The vsc and check engine lights have come on several times, when climbing steep grades it seems. I remove the battery cables and the lights clear until I put a load on the engine. The lights are not on now, but it cuts out all the time when applying gas. The car starts and idles fine. Thank you!

Please help

no codes no lights, running premium gas, hesitates when changing gears, dealer says nothing is wrong, i just bought car and thats what previous owner said.