imported post
That kind of problem sounds like it has to be ignition. My 83 would crap out at very high RPMs when I first got her. The problem got progressively worse as it started happening at lower RPMs. It turned out to be one of the coils. I would say to begin test the resistance in the primary and secondary circuits in the coils. I'll bet the problem is in the secondary on one of the coils.
That kind of problem sounds like it has to be ignition. My 83 would crap out at very high RPMs when I first got her. The problem got progressively worse as it started happening at lower RPMs. It turned out to be one of the coils. I would say to begin test the resistance in the primary and secondary circuits in the coils. I'll bet the problem is in the secondary on one of the coils.