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I had the same problem on my 85 it would start run for a sec or 2 and then die if you try to restart it right away it wont start if you let it sit for a min or 3 it will start run for a sec or 2 and die.

it was the main efi/ecu relay at the fuse panel was going bad, check it. you can make a jumper wire and and bypass the relay for a easy check / temp fix.

the relay will check ok for continuity but that does not mean it's ok you have to do a voltage drop test on it then you will see it's really bad
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