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Cammed 5.3 BACKFIRE !!

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Old 10-05-2013, 09:27 PM
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Default Cammed 5.3 BACKFIRE !!
Sup guys ok so I got a 5.3 with a 218/228 .550 cam, .015 milled 862 heads, headers, CAI. It's not tuned. So only at a low rpm ( 600-850) when I give it like 30% - 40% throttle it sputters then back fires then takes off only at that rpm though. I have no idea what's going on
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Old 10-05-2013, 09:44 PM
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It's not tuned.
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Old 10-06-2013, 12:33 AM
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So that's. why its doing that ?
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Old 10-06-2013, 01:06 AM
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My guess it's a lean backfire, given everything is good mechanically.

Is it in an F body?
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Old 10-06-2013, 03:25 AM
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Yea everything mechanically is good And no it's in a truck
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