Code PO171, fuel consumption high?

So, I got two current and one pending codes today. PO125, Toyota P1300 igniter bank 1, and PO171 pending. I have newer NGK wires on and when I lift the boot off the plug in the well #2 and #4 arc from the end of the boot to the well. #1 and #3 do not. I can also feel the spark if I rest my hand on the valve cover. When I put the wires on, I don't recall this. There's no misfire. I do only have one of the coil bolts attached. Could I not have the coil grounded enough? Also did you see my data and questions from the ECT?

No, there's spark on all 4. I was saying that if I lift the spark plug boot up while the car is running the spark arcs from the boot to the spark plug well. I didn't think it was supposed to do this if the boots were good. Anyway, I went back to basics. The compression test revealed 170-175 all cylinders. Two of the fairly new NGK iridium plugs I just put in had the electrodes almost all the way worn down and two looked good. I think they may have been Ebay knock offs. I replaced all four with legitimate NGK standard V-groove gapped at.044. The only code I'm getting is PO125, but I don't think the ECT is bad. What I think is the ECM isn't receiving the reading from the ECT. What this means and how to check it I don't know. Did you see the resistance readings I listed coming out of the ECT? Also, I am wondering about a plugged Cat because there's a strong sulfur smell after driving it full throttle and shutting off. The smell seems to be more under the front of the car not out the tailpipe. By the way, for as rich as it's running the color on all 4 plugs looked ok. I'm ready to just try an ECM. It's only $20. Short of that I'm very close to paying a tech to diagnose it. I also pulled the injectors and cleaned the throttle body, which wasn't that dirty.

Correct, the P1300 code is gone. The only one coming up right away is PO125. I tested the ECT against a new one and basically got the same numbers. I put the old one (Toyota) back in. The coolant temp is 190-200 so I know it's not that. Is there a way to check the ECT reading at the ECM? I also spoke to a Denso tech, and he informed me that because they make the O2 sensor for Toyota they cannot put their aftermarket part number or name on their aftermarket part, but it is the same specs as the Toyota sensor. The voltage from sensor 2 should be less than. 5V but it's reading.95-1.0V due to the rich fuel program. Wouldn't a bad Cat set off its own code? I'm not quite ready to give up yet. Lol #Hardheaded #Determined I've included a photo of the plugs where you can see the worn electrodes. Unfortunately, I'm not sure which cylinders were worn. But I think #1 was the first plug I pulled and noticed it. They are not shown in any particular order. Isn't one coil for #1, #4 and the other coil for #2, #3?

What do you mean #1 and #3 work in tandem?

Isn't it 1, 4 on one and 2, 3 on the other?

If my scanner reads coolant temperature does that mean the ECM is receiving the ohms readings from the ECT? If that's the case, then the wiring is intact and all I can think of is the ECM is bad.

I suppose the easy thing to do would be to try the used ECM. What about a weak fuel pump or dirty filter? There's no loss of power when accelerating hard so I doubt these are issues. Plugged Cat? Can't you check engine side of Cat compared downstream side with temperature gun to see if Cat's working?

I just have to find someone with the adapter. I had made one from the end of an old fuel pipe, but I might have tossed it.

What about a partially plugged fuel filter even though there's no performance loss? Is the filter for this car on the pump in the tank? I'm finding conflicting information, but I don't see one inline. Also why is my sending unit so slow to respond to adding fuel? I just want to try everything before jumping to the ECM. If live data shows 87-90 degrees C does that mean the ECT is working and sending the information to the ECM? I'm thinking the tips of 2 of the iridium plugs wore down so quickly due to the lean condition. What do you think?

I know that's where there's supposed to be a filter but there isn't.