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HELP! My new rebuilt 302 pops at idle. New plugs ,wires, distributor cap and rotor didn't help. Advancing the timing makes it worse... backing off makes it better. Mystery oil seems to help. I can't find a vacuum leak. The installer blames the Holly 600. Any ideas are welcome.
 

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The simplest answer is to ask the rebuilder for the name of a dyno tuner. Don't schedule it through him, just get a name. Have the car towed up there and have them hook it up. During the pulls they will adjust timing and jet in the carburetor. If there is a serous problem, they will detect it and you can use them to argue back to the engine builder. If it is the carburetor then the problem will go away. It costs about $300 i think but when you leave your engine will be ready to rumble.
 
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