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Cold start problem

Engine

Vehicle Information: Year: 1983; Body Type: Coupe;

Very hard to start after engine has sat 10 or 12 hrs. It barely stays running. After 4 or 5 minutes it runs perfect. This began the day after I filled up w/Shell 93 octane. I added Chevron fuel injector cleaner and it cleared up at first. My engine is a 1980 3.0 from DC automotive in NC. I have only put about 500 miles on since the top end rebuild. I checked the Tech Q&A and none of the cold start problems seemed to be the same. Any suggestions you can give me would be greatly appreciated.

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