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Diesel MiB is a different solvent than others. Smells like concentrated 409 so its probably a glycol ether which would explain its cleaning power. It will remove oils from your skin and rinse with water. Also dissolves engine oil varnish.

Idle speed is set by spring tension, the metering valve is nearly wide open when the engine is off. If there is the slightest varnish in the injection pump, this WOT can happen. Often, the metering valve will then slam shut from the governor overshoot, if there is varnish there, this will kill...