Hey fellow Chicagoan. That sounded awful until you said was all until warranty and got replaced, glad that problem was all solved. I wonder how you found this thread thats almost 3 years old lol. BTW if you have a 2015 4runner that would be a 5th gen.
Same thing happened to me last week, while driving CEL, VSC off and TRAC off, but the codes that showed up were p0440, p0441, and p0446, which are related to the EVAP system so I cleared it and I'll see if it shows up again. Although since no codes showed up for you I'm not sure.... btw this was...
