problem with our 2007 Lexus Es 350

Ok. I asked about this problem previously, but here is an update, About 2
weeks ago the check engine light and VSC warning came on at the same
time while driving. The car was acting funny, hesitating on acceleration, and
also showing decreased mpg, but only slightly.

I needed to get it smog checked. So I took it to the smog station, knowing it
would not pass, because of the light. When it was my turn to drive the car in
the stall, the warning lights for the check engine and VSC had disappeared.
The mechanic only said that's strange, as he had never seen that before. He
was hesitant to SMOG check the car, but said, hey 50/50 chance it will pass.
It did pass with flying colors, and the car was running great. I commute about   
110 miles per day. Up a mountain and down. Next day I drove it to work, and
no problems, Two days later the check engine light comes on again along
with the VSC warning, I had the car scanned at Auto Zone they stated a
block 2 coil was faulty. The car showed some signs of hesitancy on
acceleration, and felt like it was going to stall, but I got it home, and let it sit
in the garage. We have a 2018 es 350 also,
Now today, I drove it around the block just to check out how it was running.
Not rough, but the warning lights remained. Now in the evening, I was
curious to see how it would run, when the night temperature was cooler. Low
and behold the check engine light and the VSC light are gone again. Could
this be a short? The OBD 2 scan did say I had a weak coil, but what does
that have to do with the VSC. DO I need to change my brake pads, or have
the nitrogen in my tires checked?