ok i did the d16z6 swap, the engine is running great but i noticed that when i start my car, my car stutters like the battery is dying and then turns on, could it be the alternator, and my other problem is im not getting any air flowing through my vents when i need to defrost my wingdow

 

for the defrost problem.....was your speedo cable tight after you did the swap?.....if it was...it could be hitting the arm that moves the vent.....try taking the speedo cable off the cluster to see if thats the problem

 

about the starting means that either the starter its going bad , or u having bad conection problems and poor electric power to the car..... if ur interior instrumentations doesnt kinda light down badly when u start then its ur starter that its about to die... or maybe and simply ur abtt its not holding enought juice......

 

another thing to check along these lines is the ground cable. make sure you have a good solid ground wire from the battery to the chassis to the engine (usually bolted to the tranny since it's closer)

 

Your valve cover/bolt ground, the tranny ground, ect.