Hey guys, just swapped a z6 head onto my d16a6 block. used stock intake manifold. car started great and idles well, but when the rpm is between about 1000-3000, the throttle oscilates. the ecu throws a code 14... for IAC Valve. never did this with the stock head before. I already sprayed some carb cleaner around looking for a vacume leak, but didnt find anything. any ideas?

thanks.

 

replace it