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Tips
Tips

Tr3A vacuum advance

I assume you mean that you replaced the diaphragm assembly, that circular thing that attaches to the distributor, not just the vacuum line. It's likely that you changed something in the distributor inadvertently. Did you check the timing? Changing that assembly can change the timing.
 
Did you reset the timing? After that, just make sure all the wires in and around the distributor are not loose or shorted. Other than moving the timing way off, the vacuum canister should not keep the engine from starting.
 
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