mercedes lossing power

85 300sd. i was driving on down the road on diesel until it warm up. pop the switch and all of sudden rpm down and engine turn off. after a couple of day, i started her up on diesel and the rpm just go and down. it would rev up to 3000rpm and down to 500rpm. then rev to 4000rpm and down to 500rpm.
all filters are nice and clean. though it was the injector but took it out and clean. please help.

sounds like you're sucking

sounds like you're sucking air, do you have a clear line going into the injection pump?

I'd put a piece of clear silicon hose on the return line from the injection pump, to look for air coming out of the system.

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