vacuum leak

[tsi95]

I have a problem with a vacuum leak everytime i shift into gear, when in neutral or park it idles fine. ive looked at my hoses and everything is connected, and i tightened them all. i already changed for a new idle speed sensor. what else am i missing to check? another problem i have is that my transmission shifts hard, only when it is downshifting i get a jerk or the car doesnt move at all until it shifts. i manually shift it and it shifts fine. sorry i couldnt look this up, but its the only time i get to look up information, and i dont get enough time to search. stupid work

[MazdaX]

Hmm..why are you downshifting a automatic ?

[tsi95]

i downshift it manually so that i dont get that jerk, when the car downshifts by itself.

[tsi95]

ok took the day so that i can work on my car. tightened all the houses again this morning, and went out for a test drive. still has a leak, but check engine light came on. p0505 again? i replaced the iac some time ago, i dont want to spend another $200 so i did a check from what i read on vfaq. to test the ohms on the iac i got from 1-2 32ohms, 2-3 32ohms, 4-5 32ohms, and on 5-6 i got nothing. so i'm guessing the IAC has to be replaced or is there a way to open it and clean it. i'm going back to the shop that did my engine swap to look at the jdm intake manifold and see if i can take that one. still having problems with the tranny though.

[vanilla gorilla]

I don't see where vacuum would have anything to do with your transmission. Correct me if I'm wrong but DSM trannys are electronically controlled not vacuum right?

[tsi95]

its two different problems im trying to find out. i already figured out why my car has a vacuum leek, now i need to figure out why my tranny is messing up