I disconnected the micro-switch and got no surging. I don't know what driving around without it hooked up will do but I'll experiment.

As far as CIS-E goes, as long as the engine is running it's delivering fuel, even coasting. That's constant and the C in CIS. The only time it ever cuts fuel is when it hits redline.

New cap and rotor, seafoam and NGK non-resistor plugs installed yesterday. Running well.

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1988 300E