Bob400

I agree. That is too high. I also had a fast rpm idle and even somewhat after it warmed up. Once I changed the timing belt it seemed to slow down to normal range. I wonder if an older timing belt that is stretched could cause the timing or something to be a little out, and thus the computer compensates with faster idle? If so, you might want to check and make sure your timing belt isn't getting too old or ready to break.

Yes. Aisin is what I am going to use. Thanks.

I just bought a 1997 LS400 with 88,000 miles. (April 2015) Believe it or not, it still had the original timing belt. (88,000 miles on it, but 18 years old) It is cracked, and looks bad, but still functional. I'm taking it to the shop in the next day or two for a belt, water pump, tensioners, etc... since it is an interference engine. Crazy to think it went 18 years. I put about 18,000 to 20,000 miles per year on a car, and will plan to change it again in the next 5-6 years. The previous owner was really living on borrowed time.