you've never used it before?
I'm not sure on leaving it over the winter, I've never had it in for a winter storage session.
For the tb you remove the brake booster hose at the booster and pour the seafoam into the hose. The car will start to stumble and whatnot but probably wont stall. After you pour it in, turn off your car and wait five mins(this is a good time to reattach your booster hose). Now turn it back on and be prepared for smoke like you just blew up your motor. Should definitely be done out doors btw. It will smoke for a while and you may still see a little smoke for a day or two but it will go away. Sometimes you'll have to crank it for a bit to get it to start, thats normal.
Took an annoying idle stumble out of my g/f's 98 civic, and drastically improved throttle response on a 99 hyundai accent I had for a winter beater one year.
2009 Ford Escape Limited - 3.0L, 6 speed auto, 4x4, 25/33 city/hwy imp mpg.
2017 F150 XLT-XTR - 5.0L, 4x4, 3.55's, E-locker, xtr chrome package, fx4 off-road package.
20/25 imp mpg