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94 Ls 400 Shutters At 40 - 50 Mph


1994ls400man

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When I try to maintain a constant speed at around 40 to 50 mph, my 94 LS400 shutters. If I speed up faster, it's OK. I have noticed it seems to happen only when I am barely pressing the gas pedal.

This had happened back when I first owned the car at around 60,000 miles (now have 180,000). I had paid the dealer a lot of money on changing plugs and wires and other items. They had a hard time fixing the problem. The last thing showing on my Lexus maintenance records was that they 'cleaned the O2 sensor and wiring'.

Could this be the same problem?

Has anyone had this same problem?

Thanks

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