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Reply to "Mangusta Engine Pull"

I posted this problem in the engine section but thought I'd add it here to see if anyone who monitors this forum has any ideas.

My newly installed 302 Mangusta engine is doing something weird. It starts and runs well, doesn't overheat, confirmed with the temp gauge and infrared thermometer. After running for about 15 minutes and warming up, the idle will suddenly start to drop until the engine dies. While it starts to stumble and die, applying throttle and raising the idle will keep it running. While throttling up at this point the motor sounds good but will stumble if let back to idle. It will idle and run well as long as the idle is kept above 1000 rpm. Carburetor bowls are full of fuel. I've played with timing and carburetor adjustment. I've checked for external vacuum leaks and have not found any. Vacuum is about 15hg until it starts to stumble and then it steadily drops until the motor dies.

I plan to overhaul the carb since its due anyway,someone suggested an internal vacuum leak form the lifter valley which I may have to look into if the carb overhaul doesn't solve the problem. Any other ideas? Thanks in advance!
Last edited by 4nford
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