Could use some help....recently bought this 95 suburban 2500 4x4. Has had some electrical issues....just recently replaced fuel pump,fuel filter,also pmd module and relocated unit, after having stalling problems. The engine 1 fuse located under hood is now blowing...this causes the glow plugs to not cycle. If I "hot wire" the glow plugs the truck will start fine , but blows excessive black smoke under heavey excelleration or normal excelleration up a grade. It has 150k miles on it , but runs great. Any Ideas?