What will cause loss of power and willnot go faster than 35 and will not go into drive

as with any other warning light on your dash......get the trouble codes read and then you'll have a starting point. Don't ask us to guess which of the more than 800 possible codes is stored in your computer.

Sudden Loss of Power while driving 65+ on the freeway ' Forums ...

www.teslamotors.com/.../sudden-loss-power-while-driving-...
Tesla Motors Dec 16, 2014 - 31 posts - ‎21 authors
My car is back at the factory getting "worked on"...sudden loss of Power and control while driving on the freeway...has anyone else experienced this? ... My son was driving his '04 Volvo on the highway, when all of the sudden the car started slowing down, despite how much he ... Last I heard they were 60.

Engine Intermittently Loses Power - Avensis Club - Toyota Owner

run the fault codes and look for a problem area in the vane actuator of the turbo
it could be a sensor problem or a MAP sensor problem
this is indicated by the pressures being generated or not generated by a turbo generating pressure from the throttle opening on acceleration or held at constant speed

Traction control helps by controlling the engine power to the drive wheels to prevent wheel spin. When traction control is OFF then you can apply all power to the drive wheels and it could cause loss of control and or wheel spin.

check lh door crash sensor or wiring - flash code 35

the ls400 had problems with the mass air flow meters acting up. You will have to have it tested because they are not cheap. U can get a used one for around 100.00. They cause the car to boog down while trying to accelerate. Check the wires going to the mass air flow to make sure they are making good contact. I have seen this cause a problem. The mass air flow is located on the hose that goes to the throttle body. I have a good one for a 94 to bad you do not live in texas. leave comment

a plugged fuel filter can cause this also a defective fuel pump, the other part that can cause this is called a MAF sensor.

Sounds like the alternator is going bad and killing the battery.

the a/c will always turn on with defrost so the hot air wont crack a cold windshield.it sounds like altenator not keeping up. have it tested.if the engine realy boogs down with the a/c turned on the a/c compressor might be bad.(locking up)

I would start with a test drive with a fuel pressure gauge on it make sure you have spec. 35 - 40 psi. Clear codes and record all the freeze frame data in obd2 as you will need this in the diag process. 442 and 456 are evap codes I believe, do they return with the 300 misfire codes? Either way you need to reproduce the problem with the gauge on it and get the first code it sets. Could be fuel pump/filter/sending unit assy. In this case you will need to pay attention to the fuel level when this occurs. (same level as before)