500se 126 early 81 mod [blue coil]idles roughly and is intermittantly hard to start [hot or cold]and abs light comes on at start then goes out and comes on after a few seconds and stays on.I have replaced injectors,plugs,cap and rotor, leads and ends test ok,compression ok and even. :confused:any ideas?Thanks Wazza.

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not sure on one this old but sounds like overload protection relay fuse is blown or relay itself is faulty.