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Clear the codes. Pull the EFI fuse for 30 seconds then drive it. Your information does not add up. The biggest issue is the 52, and the PCM will operate in a safe mode with reduced timing and a richer mixture. It might be an old code, as you haven't indicated that problem driving. Unless you are...

Take a picture of the top of the airflow meter. I want to see the plastic cover.

You already have your answer.

You can also say that a MAF sensor is a type of AFM.

Mine fit without issue. At the same time, if you are pulling injectors, the fuel rail should be off anyway. You press it back on with new o-rings and a little petroleum jelly.

Don't asnwer a fool according to his folly...

Sometimes shops fix things without telling you and don't charge. Like wires in the wrong place. If it only takes a moment to put it back, they might have done that.

This false flat on its face. Toyota runs a rich tune because they did not use forged pistons. You took a chance, and took it light for all of 7000 miles. Don't do this at home, kids.

Uncle Hulka?

You can start by fixing the known isssues you listed in the first post. Flush your fluids if it has been sitting 5 years. Why do you need a power steering pump? Is it leaking?

More so in the rust belt states.

I run stock ND plugs at the Toyota specified gap.

A composite headgasket with factory torque settings can handle factory power.

Tell me about reconnecting the battery cable. Was it unhooked or loose? What does the sensor look like? Is it full of K&N oil?

That makes 4 that I know of, but wasn't counting.

Yes, it doesn't hiccup or act weird. Yes, and it is longer than the Toyota unit. When I said the same to the naked eye, I was refering to the housing dimensions. You would have to drill. Not the FCD, but the other programs. That was the "alphabet tuning" that cost thousands of dollars...

The ECU will not provide the ground path unless the conditions to do so are met. Changing the ECU is the last step in diagnostic when no other faults exist.

You don't need an adjustable fuel pressure regulator at your power level and modification with the Lex meter. I bought a new Toyota FPR (I figured 20 years was long enough) and have done nothing else to it. Of course, the car is maintaned proffessionaly...by me. In my professional...

Speculation or not, it isn't rich nor lean from the Lex meter and the 550's. Unless he installed wrong some how. Good luck trying to kill that one.