Lexus LS400 Questions

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My car will start sometimes but it will only stay on for 20 seconds and then it will shut down I thought it could be the computer I change the crankshaft sensors and a camshaft sensor they all new my car is a Lexus LS400 in 1996
My heater suddenly started blowing cold air, I turned up the temperature and it was ok for a while then it went cold again. I have just recently had the car resprayed could the sensor be dirty?
I have taken it to 3 different mechanic shops/ brake shops. 1 said they couldn’t get a code & the other 2 had no clue.
I have a 1995 Lexus LS400 that will start in park and in neutral which is normal, However, when i try to shift into reverse the starter re-energizes and will not stop unless you shift out of reverse. Any ideas what could be happening here and if you know can you point me to a drawing showing where I need to go to get started fixing this.

I have been told to find the Neutral Safety Switch and 12V brake line because they may be shorting out...I do keep blowing rear brake lights.

I have been told to check the starter relay and the starter solenoid but I can't locate either to check.

Any pictures, schematics, 1st grade instructions for repairs(Im a Mustang GT chic and know very little about Toyotas and Lexus'), etc. I am trying to get this car ready to sell and I don't want to sell it like this so any little piece of info will be appreciated!!!
fuel system problem quickly stalls
I am a light footed driver. I would think that the computer would adjust the timing. Thanks for your input. John Larson - Auburn, Washington
Car starts headlights come on but won't shift unless the reset button by the shifter is being pushed in

What seems to make the problem better or worse? Only shifts if reset button is pressed
How long have you had this problem? 1 day
Every time I hit the brakes the dash goes dim and the reverse symbol on the dash lights up
My power steering seems to stop working at low speeds and there is no leak the problem is getting more frequent and I don't want to ruin the pump I looked at some other posts and it maybe just the screen needs to be cleaned but sometimes when I manually unlock the car the drivers window rolls down and the locks unlock and lock sometimes too so I'm wondering if it's an electronic issue? Thanks for the help
This is the 1st time to happen, where could the short or connection problem come from?
first time this has occured
It takes 3 turns of the key to start, afterwards car revs fast and snatches while going into gear.
car snatches when going in gear, and accelerates in low gear
If I start the engine, it cuts as soon as it started... If I start the engine and step on the gas to pic up the refs slightly, then it idels.. But if I leave the gas it cuts or it idels but so soft you don't even hear the engine running but the engine is shaking....
Can it be the plugs..? Or what would you suggest
There's no check engine light at all with key on and no spark
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