k20 Idle problem when in neutral!

[dslt]

Hey guys, ever since ive bought my car. Ive relised that when im slowing down from 6th to neutral to a complete stop. It idles at like 1800rpm for around 5 seconds then it slowly drops down to about 1100rpm. I know this is not normal. Could someone please tell me what could be wrong? Its kinda annoying
Any help would be appreciated

Cheers guys

[barefootbonzai]

this has happened to me before aswell. If you're using k-pro, i'm guessing it's the idle setting in there.

[VTECMACHINE]

IAC valve possibly.

[dslt]

Hey whats the IAC valve?

[VTECMACHINE]

IDLE AIR CONTROL VALVE (IAC)

http://autorepair.about.com/cs/generalinfo/l/bldef_333.htm

[6000rpm]

could be faulty Throttle Position Sensor (TPS)

[AKmotorworks]

Could be a heap of things mate, from vac leak, iacv, fitv, tune/ecu

You need to go over the car bit by bit and rule each part out.

[VTECMACHINE]

True... take it a mechanic...

Let us know what the problem was.

[dslt]

yups found out the problem myself... Realised it was this knob it says boost
+ - turned it a lil bit, its connected to the intake arm. I turned it a lil and u cant really hear the air filter suction noise much, but before i turned it, u can hear the suction noise bad. now my car idles at 900rpm instead of 1800rpm =)