73 Duster motor shake

goofy73duster said

The engine is completely stock all I did was put a four barrel on and headers. I did a leak down test. There are no vacuum leaks all brand new ignition system and I did a compression test the first 30 seconds it runs at high idle there’s no miss and the motor doesn’t shake as soon as the car warms up the motor gets a violent shake.

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Why would you do a leakdown test? You changed nothing that would affect that. How have you verified no vacuum leak? Have you had a vacuum gauge on it? What is this "I did a compression test for the first 30 seconds" mess? Can you expound on that? I don't even know what that means. I can't do a compression test on one cylinder in 30 seconds. We can't help you if you speak in riddles.