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Message: <blockquote data-quote="b1pig" data-source="post: 1581132" data-attributes="member: 29440">looking at what has been said so far....Stock injectors on an engine with mods that makes it more efficient at moving air? The old 302s use older fuel metering. Unless someone altered it or installed an aftermarket ECU, the computer assumes the engine is completely stock. So timing, fueling and such are all based on that. Its not a self learning like a Holley system.Lean is mean, but too mean will ping.As said, fattening that mixture up would also be my first move.I'm so lucky my car was dang near completely stock when I got it. Hope you get it figured out.</blockquote>