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Originally Posted by phunny
hey, can anyone pls tell me why when my car warms up it idles between 800-1500 rpms? it goes back and forth like i'm reving it??? pls input guys. mods are in my profile. i dont have a pocket logger yet but i do have the safc set to were it runs smooth
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VFAQ covers idle surge rather well, but if you still haven't cheked it out, here are some causes of surge (starting with most common)
Boost/vacuum leaks
Leaking/un-set BISS screw
Incorrect base timing
Missing/damaged connector on idle switch
Bad idle conrol motor
Bad fast-air valve.