its either the ISC (idle speed control) or your FIAV (fast idle air valve). brand new they are $$ from the dealer!
there is a company that sells block off plates for them, they are really nice. i use one and my idle is perfect, the only thing that sucks is if its cold out the car doesnt warm up as fast unless you have your foot on the gas reving it up to 1500 or something.
what it does is gets rid of the whole bottom end of the throttle body, no more coolant flows thru, no more ISC or FIAV. and the best thing about it is no check engin light and the idle is perfect (although you do have to mess with the BISS to get it perfect!) here is a picture of the block off plate.
if anyone wants one of these let me know... they are fairly cheap IIRC (under $50)
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This is a CNC'd 1/4 thick FIAV/ISC block off plate. This is part of the first group in and the rest will be anodized blue and have a laser etched logo on them. Fits the DSM and 3S Throttle Bodies.
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