I had the same problem - here is some advice I got that may be useful to
you.


>I have a 76 vette and I had to replace the ingintion control module about 3
>years ago - the first time since new.
>
>Now - today it is experiencing the same symptoms - it died on me travelling
>along, let it sit for a bit while I checked it out and then away it went
>again.
>
>When I replaced it, I did liberally apply the silicon grease to the back of
>it. Now - the replacement I got from Canadian Tire (the equivalent of a
>WalWart) and I am wondering if there is something else I should have
>replaced at the same time? Or are control modules all not equal and maybe I
>should have replaced it with one directly from GM?
>
>thanks.
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It is always advisable to change the ignition coil when replacing a module
on an
HEI system. Usually the primary of the coil intermittantly shorts out
causing
damage to the module. Another possibility is your pickup coil. Every time
the
vacuum advance pulls in or releases, the pickup coil leads flex. There is
just
so much flexing a 29 year old pair of wires can take, until the strands give
out. Disconnect the pickup coil, and then put an ohm meter across the pickup
coil leads. Connect a piece of vacuum hose to the vacuum advance and apply
vacuum to the hose. This will make the coil rotate. Watch for any
fluctuation in
the ohm meter indicating broken wires. By doing this, you will also find out
if
your vacuum advance is working.