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Not this weekend, but let's shoot for next weekend. My number is 760-271-2224. I have a full scanner so we'll be able to figure out what is going on.

Not sure. Without actually seeing it, tough to diagnose.

You'd remove them from the car and look for excessive carbon build-up around the tips. If they are dirty, you may be able to use a carburetor spray cleaner to clean them. Don't use a brush of any kind, because any scratch, even a hairline one, will destroy it. You can also apply voltage to it...

Look at the stubs. Are they worn out?

I agree with Scott. Don't replace any more parts without inspecting them first. The throttle position sensor isn't relating to the shaking and neither is the MAF. I also would have checked the intake manifold for a leak before replacing it. I would check your fuel injectors and see if any of...

I haven't, but a couple others have in other threads here.

Has it always done this since you owned it? 4 cylinders typically vibrate at idle, so if the mechanic didn't have any codes then it may be normal.

I would check for vacuum leaks.

That is definitely a good sign.

Open the hood and look at the back of the firewall, and look at the top of the exhaust just before it goes to the catalytic converter, and that is where the O2 sensor is. You will want an O2 socket, or you'll have to remove the exhaust shield to get to it.

Looks neat!

Don't think anything is there. May be an expansion for something to come later.

Random pauses, or the track will decide to skip a minute.

It's a vacuum leak test to ensure that fuel doesn't evaporate from the tank into the atmosphere.

40k? That's insane. The coolant lasts 120k miles in the maintenance guide (which is a good place to look I might add). My battery lasted just under 6 years. If you notice slow starts when cold, might as well get it replaced before it strands you.

I get bizarre bluetooth streaming hiccups once in a while. Coule be related to phone updates.

Yeah, that is the steering wheel lock.

When you start the car or set it to on, you can hear it disengage.

That is the steering column lock engaging. They use electric ones on the push button start models.

Scott, it's a RWD Corolla. Lots of people race those generations in rally and track.