[Mgs] periodic miss

[Monte/Jane Morris]

 Hi everyone.
Every once in a while, at highway speeds, our 79B cuts out just for a
second or two and then runs fine thereafter. It always runs great except
for this "glitch" every once in a while. When it happens the tach
immediately drops off sharply and then almost instantly resumes normal
operation. Any ideas?
desmogged 79B with points dizzy and dual HIF's. Coil replaced several
thousand miles ago.

Thanks,
Monte