I have a 1990 1/2 ton 2wheel drive truck with a 350 auto that keeps burning up ignition modules it may run for 2 years before it burns one up.This spring I put in a brand new distributor not used or rebuilt. It ran for about 3 months and burned up another module. I was guessing a bad ground wire. I checked the grounds on the engine and frame is there another ground wire I am missing? Any help would be greatly appreciated.

probably at the back of the head...passenger side...also,up on the intake at the thermostat housing are 2 grounds....those 2 grounds must not be together on 1 stud...make sure 1 is on the housing,and the other on the drivers side intake stud