EYY
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Put a genuine bosch hei on it and never look back. Vac leaks won't have enough of an impact on timing to cause an issue (only part throttle advance is altered - total advance remains the same regardless. You don't need to have the vac advance hooked up if you graph it properly.
If it's running okay otherwise I'd be looking at fuel delivery - fuel pump, carby etc. Air leaks around the manifold are very common too. Your problem doesn't sound like it has characteristics of a failing ignition system. What sort of ignition module do they run with the EST?
If it's running okay otherwise I'd be looking at fuel delivery - fuel pump, carby etc. Air leaks around the manifold are very common too. Your problem doesn't sound like it has characteristics of a failing ignition system. What sort of ignition module do they run with the EST?