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1987 760 Turbo idle drops when breaks applied hard

posted by  someone claiming to be Brian on  Mon Oct 24 22:39 CST 2016 [RELATED]

So I've been chasing this gremlin with the idle dropping out.
So far I have replaced: inline fuel pump, filter and check valve, plugs, distributor cap and roter, spark plug wires, fuel injectors, fuel pump relay, and the injector timing relay, we find that when coasting ( like while in traffic) at 1000 RPMs and applying the break quickly, the idle drops to 500 then comes back up to 800 and stays there. Every time the break is applied hard. If the break is gently applied it doesnt do it.

Coasting at 1000 PRMs. do a quick stop. Rpms momentarily drop to 500 then immediately return to up 800. When at a stop light, it idles smoothly at 800.

any ideas out there?






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