Ford don't idle right

I have a 64 ford 4000 diesel. It does not idle right. It flutates about 50 -100 rpm in a cyclic manner - as if the throttle was being moved back and forth slighty. What would cause this? It just started this after I painted the engine and replaced the fuel return line.
 
Hi Paul,

Had the same thing happen on my windrower the other day.

Took a couple of hours to get the air out of the system after I replaced a fuel return hose.

Allan
 

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