I just changed a coolant hose underneath my airbox, and now when I turn on the car and while its running it makes a wheezing/hissing noise, and the engine seems to move around alot. Is this a vacuum leak or what? I don't know. Please help.

 

you could have just knocked the intake hose loose or off. tighted in back up. Otherwise you're spraying coolant somewhere.

 

Sounds like a vacuum leak, check the small hoses (that also connect to the PCV valve) under the airbox also check the hose (from lookin at the car from the front) on the left side of the air box to make sure you re-connected it. My friend forgot to put his back on a few years ago before he sold his shadow (he said it was running like crap and making some weird sounds) I checked the hoses and it wasnt connected. Once I connected it; it the hissing sound went away and the car ran right again, Check these first but also make sure you dont have a coolant leak.

 

All fixed. Thanks for the help. It was a hose I had knocked off.

 

Good to hear, Ive done it before too, just today actually lol...So dont feel bad.