well for the year that ive had my hatch ive never had one single problem with the engine. yesterday it started doing something wierd. it idles at about 2k then drops to about 13 and will sit there, just takes awhile for it to idle down when i push the clutch in. the ecu is not throwing any codes, no CEL, and nothing is disconnected on the IM or anything like that.

any ideas?

 

try cleaning the IACV