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1993 Toyota Supra Questions

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Need help/advice Toyota Supra 1993 ge
I'll keep the story short
. Blew head gasket and warped head, replaced both and also replaced spark plugs and leads and the car runs perfect no leaking and doesn't miss or any power loss
. Check engine light with code 25 engine running lean happens each time I drive it and warms up and each time I turn the car off and turn the car on again and start driving for about a minute or so the code comes back on but still no missing or no power loss
. Cleaned the o2 sensors overnight in petrol then drove the car for about an hour to get replacement o2 sensors. Removed the old o2 sensors and one is black while the other looks normal. Drove it home and took the new o2 sensors out to check em and the same problem one looks normal and the other one is black.
. Still getting the running lean code so decided to check all vacuum lines for air leaks and did not discover any leaks
Just hunting for some advice please because I'm close to hitting the wall and running out of ideas
I took it in to get engine light checked out and it gave me a couple of codes to include DTC:41 TPS Circuit. I replaced the TPS but it keeps doing the same thing. It feels like it's not getting enough fuel. It all started a month ago after I topped it off, as soon as I got on the highway it started stalling to the point it died on me. I got it to start again and ran fine all the way to KC. Once I got over there I put in that foam treatment into the fuel and worked fine for a month. Until a week ago on my way back from KC I topped it off again and started giving me this issue again. I think it might be bad fuel and maybe need to replace my filter. But I need a little more suggestions that can help. Thank you
1st 2nd and 3rd gear work fine but once it get to 3rd gear it just stuck there like the car is stuck on overdrive or the manual button. I try the overdrive and manual button but it still does nothing. Yes the manual and overdrive light still work just transmission not shifting.
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