1999 Lexus RX300 Questions

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My taillights, running lights, and brake lights aren't working and I've replaced all of them. The problem with the lights came after a trailer was attached to the vehicle. The rear side lights are not working either.

looking for the cost to replace both knock sensors and the harness

And it won't go over 3000 rpm when I try to accelerate it just chokes out...will idel fine.. but hard to start

All calipers, pads and rotors are new and just put on. I jacked it up after driving it for a couple minutes and could barely turn the tires and all the rotors were really hot.

I drove to a gas station got gas then it wouldn't start. my Lexus has 125000 miles on it. I recently replaced both knock censors.

What should be the reading of O2S B1S2?
The readings I get, at idle, temperature 190*, vary from 0.000 to 0.010 to 0.770.

The car while driving sets P0125 code first then later will set P0172. While the car is sitting still, at idle it only trips the P0172. However, leaving idle for another 5 to 10 minutes it starts setting the misfire codes (P0300, etc).

I had a check engine light come on over a month ago. My scanner said it was a P0171 $10 generic code, bank 1. So I changed the air fuel ratio sensor. The code cleared, then I had a pending code for, I think P1153 incorrect signal pulses to ECU on bank 2, so I changed the bank 2 air fuel ratio sensor. The codes reset for about a week then bingo I now have P0171 $10generic, back again. I removed the MAF and cleaned it with MAF cleaner. It is the original MAF sensor. The vehicle has 137,000 miles on it. I am retired and really do not drive it much. I bought it 6 years ago and only put 20,000 miles on it. I do change oil and filter every 4 months. The air filter I just changed. I did notice that a hose just above the filter and before the MAF sensor was off. It must have been off for since my last air filter change, which was about a year ago. I did check the intake manifold and valve body area with carburetor cleaner and I did not see any change in my idle. The idle is a little rough and you can smell a rich exhaust gas. I did check a lot of the small vacuum lines and they look okay, nothing brittle with good connections. Not sure where to go from here.
I read several articles on this subject. I am seriously considering getting some injector cleaner and adding it to my fuel, also I was going to get some fuel conditioner. The next step it to have the fuel pressure checked.
Any help would be appreciated.