idle surge on a f22b

[vmchurch]

My car is a 90 Accord with a f22b in it, and a swapped in JDM 5spd. When it was first finished, the car had bad idle hop due to a bad brake booster. I know it was the booster for two reasons: removie the vacuum hose and the car idled completely fine and the fact that i had little or no brakes. I bought a booster (cheaped out and went ebay), out it in and it still does it, but its different. Now the car idle hops bad (500-1500) when its cold outside and stops when its warm outside. If i listen to the booster area after the car is shut off, you can hear a leak, but only if the booster vacuum line is hooked up. If I unplug the IACV, car idles ok but obviously throws a CEL. Any ideas? I'm thinking its the booster again, but i just want other opinions before i fork over the cash for a honda one and do all that dam work. Thanks guys, sorry for the novel

[NAiL05]

When you mean cold outside is it only idle then when it warms up its ok again?

[vmchurch]

no i mean if its cold outside it does it all the time, but now that its warn it does it A LOT less.....

[ntcb7]

try your im gasket o have a f22b and i put a new im gasket it on and mine stop doing that.