okay well all the questions kinda relate to the same issue which is my idle and here it is, i used to have bad idle problems until i took out my iac and took an air compressor thing and blew air into it and it idled find sorta just not jumpy like it used to and now im getting alot of different things
1. when i drive on the freeway and i get off the freeway i idle really low i dont think thats normal
2. when i hit the brakes my idle drops
3. is i bad to sit in idle and your car is like shaking..

all these problems are starting to really bug me and i have no clue whats the cause of them, i cleaned my iac and it still persists any input would really help

 

sounds like you iacv is going bad....shaking is just low idle and your car close to stalling it sounds likes. How many miles? last tune up was done when? What motor is in your car?

 

supposedly the motor had 30k miles on it last tune up was i have no clue and the motor is a jdm d15b my friend said my flywheel is shaking the tranny cause its an 8lb flywheel but that sounds like crap to me.... my friend has the same car minus the flywheel and his idles at around 100 or something and his doesnt shake

 

ttt

 

Im making it short and simlpe,

Check you vacum lines, All of them