Diesel Bombers - 1997 7.3 lope at start cold and warm

I took a gamble and bought a 7.3 with 100k on it but it would lope at start cold or warm if you Rev ed it up for a second it would even out though. The truck had only put like a couple thousand miles on it in the last 4 years and I did sit in a garage those years. When I bought It I did notice the truck had a small fuel leak by the fuel bowl so I resealed and cleaned the bowl. Before this I also ran 2 tanks through it with hotshot diesel additive and the lope went away for a couple days. Then I flipped to the back tank which still had diesel in it from who knows how long ago and it started to lope at start up again. I ran a couple tanks through the other tank. The lope actually got alot better and did rev as high at lope. I changed to synthetic t6 oil and the truck ran alot better but still loped. I resealed the fuel bowl after all of this and the lop stopped for a while. But then it came back and I noticed that I messed up the oring on the bottom of the fpr. So I ordered a new ring and diesel drips out of the fpr until I get the oring. My question is what could this be injectors? Hpop? Bad diesel? Dirty tanks? Fuel leak I am still waiting for the oring. Also the truck was in Florida until 2008 I ran the farfax to make sure. I really need help.