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Almost positive the issue is going to be a failed head gasket that needs replaced. Need inspection to be sure and a replacement soon before damage is done.
Have the check engine code read and post result on here to further assist you. Sounds like one of three things : A misfire condition, Bad o2 sensor or vacuum leak. Need code to determine. Autozone reads for free.
If it was the neutral position safety switch, it would do nothing. Zero crank, zero noise at all. Is the check engine light on?
Have the battery charged up. Then try to start. Battery may have drained because something was left on.....
It could be th
Probably a failed purge valve solenoid that needs replaced.
Yes, it definetly could be. Lack of power on inclines and on acceleration and sometimes rough running in idle are synptoms of a fouling catalytic converter. Do you have a check engine light on?
Here you go : http://www.ehow.com/how_6687789_change-fuel-filter-lexus-ls400.html
Well, you are probably way overdue, but it is still working. So have it replaced at your convenience. I wouldn't wait till 200k though.
Very well could be a problem with the brake pedal switch no longer functioning properly and may need to be replaced.