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I have high flow Cats so I know all about those Foolers.

That is called a O2 Fooler and is used in the downstream O2's when aftermarket Cats are used. The Aftermarket Cats will not let the ECM like those Cats.

Not sure how much it can be off, but should be pretty close to centered.

I'm not talking about pull, just if the steering wheel is centered when driving straight.

Is your steering wheel centered when driving straight down the road?

Is there a little red dot on in the upper right corner of the dash cluster?

Gas has nothing to do with it starting if the starter isn't turning the engine over.

Did you happen to look at the flywheel teeth when the starter was out, it could be missing some. You could try turning the engine ever by hand the next time it won't turn over. Then try starting it just to see if it has teeth missing in one spot.

I used NGK on my JK and never had a issue with them, actually they are called NTK. This is where I bought mine. https://www.ngk.com/ntk-oxygen-sensors-ngk

I might add if you still have the junk Factory battery clamps replace them for some HD ones, it's been found they do cause quite a few electrical issues.

I replaced my TB with a OEM one and did the gas pedal reset and never had any issues after the first couple of times.

Some Members have bought parts that aren't OEM and had issues on electronic Parts.

Not supposed to be a plug there, it's just the way that crimp piece is made that holds the hose to the line.

Here's a LS build, https://wranglerjkforum.net/threads/2010-jku-oljeepy-ls-swap-build-thread.32415/#post-468540

When I bought my 2008 JK it has a Teraflex Big Brake Kit on it, when I researched Big Brake Kits the parts were the same as a 2002 or 2007 Dodge Ram 1500 I think. It's been to many years ago since I researched it but one of the other Jeep JK Forums had all the info. If I get time i'll try to...

Try adding a lock washer and a flat washer to to each bolt, if the starter has that much movement your likely going to wear the teeth on the starter and flywheel out from the starter moving around.

You think the Jeeps have alot of problems you should see how bad the newer Dodge diesel trucks are.

Big difference between a GM and Chrysler Engines.

A build Thread like this will be very beneficial to a few Members, anything to make it dependable.

Try raising the front of the Jeep up about 6" with the cap off and engine idling, most of the time that works the best to get the air out.