1995 nissan truck ignition problem

[gustilo1]

I have a 1995 nissan truck v6 3.0 liter auto 2 wheel drive. My problem is I don't have spark on the coil when the distributor is in the engine. I pull out the distributor and spin it by hand then I have spark. the rotor turns when the engine is cranking. I replace the iginition module. I grounded the distributor while i spin it by hand and it still has spark only when the distributor on the engine and it will not get any spark. help!!thanks

[Venturi]

Have you checked to be sure the dist is properly grounded when it is installed in the engine?