o good gosh yeah, a nasty throttle body can cause all sorts of problems

replace the hose i can't tell from what a your referencing if its a vac line or just a vent line but it'd be a good idea for them all to be right before you go for boost

tps should toss a code so thats probably not it unless the check light has been removed or burnt out might want to stop by an autozone and ask them to scan it anyway

sounds like you need to just go stem to stern on the car and see if you can find any more issues the uz motor is a pretty reliable motor you shouldn't have many major issues if maintenance has been simi kept up on the car. (dirty throttle body is not major lol)