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What kind of plugs and wires are you running? How old are they?When you open the throttle, the engine gets a denser charge. Denser charge is harder to ignite. Sounds like something in the ignition is on the edge. When you give it a denser charge, it can't ignite it.
you said you grounded them to the firewall, did you try grounding to the engine block?Rich, I'm confused by a "denser charge", what does that mean?