This sort of thing (sudden massive problem) never really surprises me with Supras, and, as much as I love the 7m... it happens to us all. Has this happened to you before? If not, I'd suggest that your car is just testing your faith. Don't be so quick to sell, let it sit for a week or so, think it over... do you NEED a car so bad that you've been using this as your only daily? If so, I can't help but think you had this coming man... just hang in there.
And, for what it's worth, you know your shit, but it couldn't hurt to take a look at that "living with a Supra" thread in my sig... just for perspective's sake.