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The trunk wires cause all kinds of weird problems. I thought my transmission was going out the first time.

When i purchased my '98 LS400 it had two issues 1.) The famous check engine light was on 2.) The engine was vibrating like hell, meaning rev upto 3000 rpm and you could feel whole steering wheel vibrating Now what i did first thing, i took it to a garage drained out all the fluids i could, engine oil (which was turned into water, with 0 viscocity), gear oil (again the same situation), and the radiator coolant (although it was full, but when i drained it was water) all this i changed with good fluids also replaced filters Now when i drive surprisingly all the lights are gone or may be i am lucky, For the vibration problem a good car wash did the trick, good means you lift up the car on the hydraulic bay and spray diesel with full pressure, also open the hood and spray diesel with full pressure, well this method may sound wierd but it did the trick for me now my LS is super smooth, otherwise i was afraid that if the vibration does not go I might have to replace the engine foundation rubber pads For temperature there is a high probability that the water pump is dying since your temp gauge is going above the normal limit, first try to change the coolant with a good one, completely replace dont add up