Lots of blue smoke??

I have a 1988 F250 7.3 IDI with ATS turbo and auto with gv overdrive. Last time I pulled a truck on a trailer up a hill and was in drive with 12PSI boost and EGT around 700. My engine temp was around 3/4 gauge before hot. Soon after it would start hard and when idling it would have a miss and some small amount of smoke. Then I couldn't get it started after sitting two weeks and had to jump it with my battery charger. I pulled a trailer for my brother a short distance with no trouble but when idling it would miss even more and smoke more. Then on my way home it really started to smoke blue like you had a gas engine with broken rings. When I let off the gas going down hill almost no smoke but when I get on the gas just a little bit it starts smoking like crazy agian! What is going on with the truck? What do I need to do to fix this? I have let it sit now for a couple months.

Thanks!