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I have a 1995 Cutlass, 3.4 DOHC engine, 75,000 miles on it. It starts fine when the engine is cold. When hot, it sometimes will crank fine, but will not start. Sometimes extended cranking will get it to start. If I do get the hot engine started, it runs fine. Other times the hot engine will start with no problems at all. Does anyone have any troubleshooting advice they can share? I would like to diagnose the problem so I am not blindly replacing parts.