1999 Dodge Caravan. Just quit running. Now blows engine f

Electrical problem
1999 Dodge Caravan 6 cyl Front Wheel Drive Automatic

Leaving a traffic light the engine stops running. Found blow engine fuse under hood, replaced it. Fuse blows. Looked for loose or fried wires and checked grounds - OK - Unplugged computer beside battery, fuse doesn't blow. Replaced computer with a rebuild, engine cranked up & ran fine for about 6-7 miles then began running weird and began blowing HOT black smoke from exhaust. Parked it and shut 'er down, now engine fuse blows when ignition is turned on. I'm hoping that I haven't trashed the replacement computer. I have since located signs of the wires leading from computer that may have been damaged from manifold heat, but are located on the BACKSIDE of engine and seem impossible to access without disassembly of the half the engine. Are there other issues that might relate to this type of problem? Van had been running great with no signs of problems up until dying. Strange reliability issue to simply have a vehicle to die with no prior indications any problem.