alright car is 1992 vx motor b20 vtec. i was gettign codes 41 and 43 i changes the 02 senser and 43 went away but 41 came back. the idle problem, i will be stopped and my car will idle at 2000rpm's then ill tap the gas to see if it comes down and it jumps from 1000 to 2000 i cleaned the icav changed the plug i dont no what to do and i screached.

 

my d16z6 does the same thing when i put antifeeze in it it stops until i get low on antifreeze again

 

i have the same motor a d16z6, when i start my car first thing//when its cold,its up 2000rpm, once it warms up it goes down, but on average its @ 1000, every now and then it gets where its suppose to be, sometimes i stop at a light and it starts that vrom vrom crap again. i don't know what its called but most of the time its that thing placed on the back side of the intake manifold,and some people have told me that the timing can be off too.or it can be alot of things.check the timing first, and work your way from there, if you fix yours let me know.