[V8] 91 v8 running on 4 cyl.

[cny86400 at centurytel.net]

Hi All, My V8 dropped 4 cylinders going down the road. I made it home and
figured a bad coil! I bought a used one (guaranteed) and just got it in. 
Cleaned the plugs, fired it up And the same thing! Ugg! Took one plug out - no
spark! The Dist caps were replaced maybe 10K miles ago  - they still look good. 
Wires were also replaced at that time. Any help would be appreciated, Greg

Also, Engine timing sensor was replaced prior to this happening. I do not think
it's related.