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Hi, I have a 97 TLS and I notice when I am in 5th gear and 50 and 60 I get a surging in the engine, above 60 it seems to go away. It will also happen in 6th as well, so with out looking at the speedo I always know when I am around 55. Any thoughts?
 

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It sounds like it has not had any ECU updates, they ran so bad that there was 4 different ECU's out, if you complained when it was new they would throw in a new one and hope it went away. You can take it to a tuner and they will use the Yoshimira box and write directly on the eprom in the ecu and change the map. I had my 98 tls done about 2 months ago, it will now idle through a parking lot without kicking or bucking and all of the surging is gone. Mine was bad between 3000 and 4000 rpm. do you have different pipes and K&N filter in it because after I put that on mine is when the surging got really bad?
 
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