Ford Other

I have a 1981 ford 250 pick up, with a 351 cid engine. Last time I started it it was hard starting and stalling. Now I dont have any spark.I cleaned the distributor contacts and rotor, changed the plug wires and coil.I have current on the positive and negitve side of the coil when I turn the key on, but no current going to the distributor. This is an after market distributor rotor and coil, made by MSD. Any help would be appreciated. Thanks
September 4, 2006.

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