you can reset what your ECU has "learned" by disconnecting your battery for twenty minutes. If that does not work you can look into having your ecu replaced, ECU's from early GS400 had some problems.
I had mine replaced but can't remember the details. You can try a search for the problem at www.clublexus.com.
problems in lower gears
in 93 - 05 Lexus GS300 / GS400 / GS430
Posted
you can reset what your ECU has "learned" by disconnecting your battery for twenty minutes. If that does not work you can look into having your ecu replaced, ECU's from early GS400 had some problems.
I had mine replaced but can't remember the details. You can try a search for the problem at www.clublexus.com.