On those old IDI's, (if it still works) there is a fast idle solenoid and cold timing advance on the injector pump to help cold starts. With key on waiting for glow plugs, tap and release the throttle before starting. The solenoid can't open the throttle but it can hold it, that's the only reason why you tap the throttle. The high idle is only a few hundred RPM or around 1000 RPM, and it will shut off and return to regular idle automatically around 112*F coolant temp.
Most people never knew about this feature, and the solenoid can get sticky from never being used. If it doesn't work, sometimes you can spray a little wd40 on it and move the plunger in/out a few times. These features are not required for cold starts, but they do help starting and maintaining a smooth idle when cold.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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