still trying to figure my hi idle
good thing its mostly when cold started & it idles fine in drive.

1600 is very high

mine starts 1200 then can go to 1500 as it warms then down to 900

I had a few obvious vac problems
but they really haven't resolved it
also got a weird warm up reg config.

start by searchiung for hi idle

narrow it down
does it do it all the time & in drive too?

ABS light on would point to OVR... My ABS light isn't on but wonder if it could still be an intermittent problem but wouldn't that mean it would idle fine at times?...

did it just start or did you get the car like that?

someone might have it all off

so many things can affect idle so you have to ry to narrow it down

seems you are getting to much air
so might be a leak somewhere or a faulty valve..

I don't know & am basically reading & hoping to find something thats an easy fix...

Good Luck

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83 500 SEC Euro 198K