3800SC idle question (Page 1/1) Lou6t4gto JAN 30, 04:38 PM 2000 3800Sc from GP, (still has All stock components, EGR and such). starts right up idles a little high initially, then after about a min, it drops to about 900. thenafter about 2 minutes, the idle will start to rise again, to about 12-1400 RPM. any ideas ? no vacuum leaks. thanks OntarioKev JAN 31, 09:43 PM Did someone tune that PCM for you, or is it straight out of the wrecking yard? Sometimes from the wreckers you get something that has a weird tune in it already. It sounds like the idle goes high right around when closed loop kicks in. Usually a high idle when going into closed loop is something not accounted for in the tune causing it to run poorly. Examples that can cause it: Air leak after the MAF (would have to be pretty significant for an idle that high). IAC issue Bad/failing Injector(s) Those are the main ones I can think of. Other than a messed up tune/PCM that can really cause issues. Lou6t4gto JAN 31, 10:47 PM INJs are new, IAC is new MAF is not leaking. pcm was done by Danny Mcllmoy in canada.