I have a 99 GS300 also and my car did the same. It accelerated on the highway without me pressing the gas. I had to get my back brakes and rotors and calipers fixed. A week later my car wouldn’t accelerate at all and all the lights came on. My mechanic replaces the throttlebody but it did the same thing. What else can it be??
Throttle Problem With 98 - 99 Gs Series
in 93 - 05 Lexus GS300 / GS400 / GS430
Posted
I have a 99 GS300 also and my car did the same. It accelerated on the highway without me pressing the gas. I had to get my back brakes and rotors and calipers fixed. A week later my car wouldn’t accelerate at all and all the lights came on. My mechanic replaces the throttlebody but it did the same thing. What else can it be??