1992 Lexus LS400 Questions

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I have one bad converter on the driver side and the car drives very slow my dad said I have a bad coil but I don't want to go spending money on the wrong things I changed spark plugs timing chain last year but I haven't drove it in almost a year now please help me out
Seems battery id dead but its not
All major work under the hood has been done and battery replaced. Car has been sitting a while. Replaced fuel pump and filter tune up oil change and all
same as obove
I have tried everything.

Did test, did tuneup.

Replaced a lot of sensors.

92 LS 400 - Just started today, at any speed from idle/stopped to highway speeds, car won't accelerate and bogs down unless I floor it. When I do floor it, it jerks like it just suddenly got a blast of fuel and leaps forward. Then it's fine for a little while before it repeats the same. Almost all stops or low speeds cause it to happen though. Only flooring it will force it to accelerate. Anyone have an idea what might be causing this?
could it be the mass air flow sensor?
It's going through a lot of power steering, but it's not leaking on the ground and I can't find the leak.
So much smoke comes out of the exhaust, that when I leave the area it looks like there was a fire in the area. It happens when I start the car or when I accelerate.
it stalled when i tried to restart it it turned over but wouldnt start the engine got wet a little
changed the engine and harness what all do we need to check when replacing engine for as electrical
The seat belt warning light does not come when I start the car and belt no fastened. The warning light is visable when the key is turn on (not started)
i had both rear os replaced, do i need to replace front os too
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