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Check engine light came on, took it to autozone and had it scanned. The printout said idle speed higher or lower than expected. It idles around 600 rpm. Can't find a vacum leak, iac is new,throttle body is clean. Possibly poor electrical connection? The car runs great, the only problem I have is sometimes if I drive the car and turn it off and start the car and drive for about a half block the motor runs like crap and then runs fine. Mods are in my sig. any ideas? Thanks