First off you said it was having trouble cold starting. Does it crank and crank and crank endlessly before firing, or does it fire up immidiately with a big cloud of smoke , then die right away, then you have to crank and crank and crank endlessly to get it to fire again ?
This information will tell us a lot If it does the first, you most likely have an air leak in the return line system, if it does teh second , you have one or more injectors leaking at the nozzle
Also, locate the cold start advance solenoid on your injection pump ( use teh search feature here on this site and you will come up with a diagram or picture ) and then have someone turn the key on while feeling the thing to see if it clicks, if not check to see it is getting 12v
Do you get any engine knocking at partial throttle, kind of sounds like a gas engine with a bad rod bearing, but it goes away when you let off the throttle or lay into it full throttle ?
This information will tell us a lot If it does the first, you most likely have an air leak in the return line system, if it does teh second , you have one or more injectors leaking at the nozzle
Also, locate the cold start advance solenoid on your injection pump ( use teh search feature here on this site and you will come up with a diagram or picture ) and then have someone turn the key on while feeling the thing to see if it clicks, if not check to see it is getting 12v
Do you get any engine knocking at partial throttle, kind of sounds like a gas engine with a bad rod bearing, but it goes away when you let off the throttle or lay into it full throttle ?