RE: Firing off my 6-71's
Pull off the valve cover , and be sure all the injectors open and close with throttle movement.
ALL must move together.
Many DD simply pull the gov into a no fuel point on the gov , where the injectors do not supply fuel.
That is why you check the rack movement.
DD do not like to be cold (freezing) to start.
Best is a block heater in the coolant circuit , at 40F technique is required.
Crank 30 seconds , let the starter cool 45-60 seconds , repeat , should start on 3rd try with tons of white smoke for a couple of min.
In cold (freezing or below) ether is OK , a 2 second squirt ONLY , use AFTER the engine has been cranked 2 or 3 times as above.