Idle chat

[martin.herwitson]

Can anyone offer some advice? I'm struggling. Silvias idle speed has increased and now runs about 1000rpm, If I simply adjust the tickover then its too low when the engine is cold? I have tested the air control unit (choke?) as detailed in the manual...o.k. tested the engine temperature sensor...o.k. I have noticed that switching on several electrical items, lights, heater & rear screen heater causes the rpm to drop and I'm sure there should be some automatic compensation for this but I can find no mention of such a unit in the service manual and I can't think of anything else that would increase the idle like this?

any help would be appreciated.....Marty