High idle when warm

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Joined
Aug 7, 2004
Threads
48
Messages
227
Location
San Diego, CA
Still trying to chase down my emissions problems. I've got a high idle when warm. Obviously, the tach is nothing to be picky about but I'm estimating around 1100-1200 RPM at idle when warmed up, vice the normalish ~700 or so when just starting up. Oh, and my mileage dropped a couple of miles to about 10 (maybe 9!).

I will be getting a tach for adjusting idle soon enough, but what other things could cause this? My first thought was a slightly stuck choke, which I need to check, but I'm thinking the behavior when cold probably rules that out.
 
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