i have jdm b16 and replaced the intake manifold. new maifold gasket and new tb gasket. my idle goes up and down from 500 to 1600 rpm non stop. i was wondering if someone can help me. i cleaned out my fiv already. please help going crazy

 

there is a vacum leak somewhere. just get some carb cleaner and spray around all of the gaskets.

 

CEL?
did you swap the IACV plug with the purge evap plug?
Did you happen to replace the throttle body gasket? if so did you get the right replacement gasket?

 

im a newbie so bear with me...i saw there was another plug that connected the exact same way and then it threw a check engine light. so i plugged the other one back on. when i pulled a thin vaccum line atop the tb it idled or more like wanted to stall out. then i sprayed cleaner into the tb where the spring is and then idles perfect. bear in mind the car doesnt idle at all...just stays at around 1500 rpm