Looking for suggestions on fouled glowplugs-98 E300TD

[ready-ronnie]

My 98 300 sat at body shop for 3 months( My Sons run in with deer, first week. in Nov.) I picked it up last wk. It was half full of I believe summer fuel.
After I warmed it up good, I gave it a good Italian tune-up and it ran good. The next day I backed it out of garage, it was missing and smoking badly and I put it back in garage. It is going to set for another 4 months. Glow plugs are fairly new. What would you suggest I do when I start it this spring? I have all the stuff for a diesel purge.