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Well welcome aboard, I want to say I am a anti-bosch lover. Everything I have put them in has had running problems...On our Lexus/Toyota engines please only use NGK or Denso iridium plugs. They last 100k miles easily if not even longer. My friend has a Mercedes/BMW garage and has experienced the same issue time and again on those vehicles. Not sure what he uses, but He has had countless customers come in with bad running engines and performed a Bosch spark plug removeal and problem is fixed. Now on a side note the Coil packs on the Lexus engine can be damaged if you wash your engine. But pay very close attention to the spring inside the coil pack and make sure it is not corroaded or damaged. It has to contact the connector end on the new plugs....Rip those Bosch out, and replace with the awesome iridium plugs made by Denso or NGK.

1996 es300 327,000. Third owner of since I bought it at 260,000 - April 2008. Just replaced Water pump, seals, and Timing belt (myself) at 315,000. I really haven't put much money into it since I bought it. I bought it for $1200 usd and had to replace the fan (run by the power steering fluid) when I bought it. The tranny started acting up at 290K (I'm sure it is orginal since I know the people who have owned the car since 80K) changed the fluid - problem went away. Tranny acting up again (when below 40F) I going to change the fluid again. I'm on this site because I was looking up problem with a rear tire wearing funning - looks like I need to change some bushings! Looking at taking car to 400K+. Also, I am going to buy same year (1996) es300 car for 1000 with 220K this week!