My car does the exact thing, the whole idles high, and when I mash the brake it drops down idle, I too have starting issues, and my gauge cluster and lights flicker like if they are pulsing, I have not done anything about it, just the other day I started to hear whisteling noise come from the alternator, that I changed out 2 years ago, I will be changing it out tomorrow since it's still under warranty, I found out that start up issue is due to the fuel pressure regulator sensor above the fuel rail also someone mention that the flicking of the cluster is due to a piece that's behind the cluster, not sure what it's called though. Anyways after I change out my alternator I will let you know if that helps, also one thing that did help out with idle was I cleaned out my tps sensor and dragon throttle body, and I took of my custom tune and reinstalled it.
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