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Hello everyone, this is my first post so please excuse me. I have a 1999 LS 400 with just over 90k miles. I recently noticed I have a low idle of 400 when in drive, and only drive (D,4,3,2,L). In reverse it is 650. In park or neutral 850. If I turn the headlights on the idle is becomes 600 in drive. The other idles remain the same as before. Also, if A/C is engaged the drive idle is 600. I cleaned the MAF sensor and did a spray cleaning of the throttle body (removed air intake hose and sprayed butterfly). I have no check engine light and the car runs good other than the low idle. I also always use premium fuel. I am just puzzled that the low idle is only in Drive, and not Reverse. If anyone has any insight or ideas I would greatly appreciate some input. I do apologize for the long post, but wanted to explain as best as I could.

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