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I don't know what does basic salary mean, but if you're on low income / tight budget, I would not delve into such projects but rather use the money to make life easier on the more important fronts of it. These are mean machines and money pits.

Do you have good fuel pressure and / or good injectors?

is the engine timed correctly? Have you the checked the timing belt marks?

Oh, this is one huge DIG.

Which version of the 1uz do you have? If you have the one that came with a 4speed transmission, you can swap out your cruisers transmission to the a442 ECT version. and use the 1uz-fe ecu to control that 4 speed ECT a442. It will do so nicely. the 1uz with 5speed transmissions - those...

engine coolant temp sensor good? Coolant bled properly, ie no air in the cooling system? if the engine is missing or performing bad / hesitating specially when warm, have you checked and confirmed if there are no vacuum leaks, good ignition system and plugs.

is the M-REL output wired correctly? IIRC, the ecu uses the MREL to keep itself on even after you turn ignition off to reset the IACV motor. So the next startup it causes fast idle and then slowly comes down to set RPM when at operating temp.

Check for errors, the 50200 ecu should work without any problems

many many congratulations

I don't have one at the moment, try here: https://cardiagn.com/lexus/

erhmm. End of battery / alternator can cause all sorts of problems, I would suggest to fix that area and all power connections. A bad ground can cause such issues as well because then the ECU cannot power the solenoids properly. ECU provides +12v to the shift solenoids and they are grounded...

Thank you good sir!

You removed the valve body? There is nothing to inspect if you didn't remove and disassemble it.

I may have a pinout and a wiring diagram, pls share your ECU pinout pictures here

The valve body is the heart of an auto transmission, the solenoids are fitted on this valve body - solenoids are commanded by the ecu to open or close individual hydraulic circuits inside the valve body.

Is it indeed, but its a levered mechanism operated by a solenoid - when you press the brake pedal the brake switch sends +ve to the solenoid.

yes and their connection stability ie it could be an intermittent connection on either of those coils

Ground and Power to coils ok?

So you know the problem, you need to wire the shift release mechanism :P

if a solenoid fails completely it should really register an error code, plus it will shift stupid and not shift in to a few gears. by your description of the problem its likely you need to inspect the valve body assembly