I recently built my b16 block and put it back together with the stock b16a head and the car idles badly and sometimes just shuts off. Dont have no clue what could it be i replaced the iacv but that didnt do nothing.

 

could be a vacuum leak or timing maybe? how did it run before the rebuild?? why did you tear it down and what did you replace?

 

it ran great. i replaced the block with a b16 block that has ctr pistons new crank and rods