Elise S2 111s Idle speed too High!

[G_Reaper]

My 03 reg 111s  has started idling too high at approx 1300rpm occasionally the
MIL/CEL light comes on but not all the time. When first starting from cold the engine will settle down to a normal idle but when hot the engine idles at 1300 rpm slightly fluctuating.
Can anyone help?

 

Cheers Mike

[rogerch]

I think mines too high @900rpm, but if your's is irregular, I'd start by looking for an induction air leak.

[rogerch]

OK, yes mine will tick over at 900rpm quite happily, but it takes too long to get down there, down to about 1200 fine but then very slowly down to 900. I know this is the way engine management systems handle things these days but I don't like it.

When I come off the throttle I want it to snap shut NOW! Any ideas how I adjust this, the throttle body butterfly is adjusted out as far as possible.