I have a surging idle on cold start only (500-1500rpm). As soon as it begins to warm up, my idle is perfect (See idle vid in signature). Am I correct to say that the only things to blame could be the IAC or the timing. I already have the idle adjustment plate and a new alternator. What are some other things that could be wrong on a cold start and not on a warm engine? BTW Car idles fine around 600-700 RPM with the IAC disconnected.