Bob Witzel Posted November 15, 2022 Share Posted November 15, 2022 I just purchased a '95 Lexus LS 400 with 100,000 miles and on the highway, when I lift off the throttle the car 'bucks' or 'shudders'. I have had the transmission checked and it is fine; what are the other suspect areas? Quote Link to comment Share on other sites More sharing options...
RX400h Posted November 15, 2022 Share Posted November 15, 2022 From mechanic Tim Charlet: Typically a jerking sensation you are describing is due to a fuel or air restriction in the fuel system, possible caused by a damaged or incredibly dirty mass air flow sensor, throttle body or fuel injectors. However, the first question I’d ask was - when was the last time the transmission fluid was changed and filter replaced? Overtime, the transmission fluid and filter debris can become stuck in the hydraulic lines of the transmission and cause similar symptoms. It’s also common for these symptoms to be more noticeable when the vehicle is at operating temperature. Quote Link to comment Share on other sites More sharing options...
paulo57509 Posted November 18, 2022 Share Posted November 18, 2022 Sounds like the torque converter clutch has a problem. Quote Link to comment Share on other sites More sharing options...
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