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so my ls400 stalls and check engine  light. comes   on for a few seconds and than turn off ,   and this will happen every time I step on it .  when I say step on it I mean that I am trying  to go faster.  

 but if I drive normal it will works just find ...

  any advice or tips what that may be so that I can fix it

 

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Juan welcome ……. you have a 94 Ls400 ?  How long have you had this car and experienced this problem ? 
 

Does the car engine actually stop and you re-start her while still rolling or do you actually get to a stationary position before re-starting ? 
 

You’re in the UK ? and the cars been serviced annually or more and current MOT showing no issues ? 
 

Has anyone tried solving this problem before ? 

Asking these  Qs and your answers might help to solve this mystery ……. and encourage more Qs from Members with Ls400 experience 

Malc 

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Hello Juan and welcome to the LOC.

As the check engine light comes on briefly there should be stored fault codes in the engine ECU which you can access and will hopefully help you diagnose the problem.

The link below explains how to do this and includes a couple of video links showing how to do it.

http://www.lexls.com/tutorials/intro/codereading.html

Once you have the codes please post them up so we can assist you further.

Without further investigation it is very difficult to say what the cause is and buying random parts hoping for a fix is the most expensive way to go.

However given your symptoms and the age of the car it could well be the engine ECU which are well known for leaking capacitors, take a look at the link below particularly the “symptoms” sections where it mentions the engine bogging down around 2000 RPM

https://www.clublexus.com/forums/ls-1st-and-2nd-gen-1990-2000/656360-all-my-crazy-lexus-issues-solved-ecu-leaking-capacitor.html

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