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Power Strokes
7.3 Tech
38r surging bad under load
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[QUOTE="TARM, post: 655981, member: 578"] That would be my first guess is you have a boost leak as it seems to happen once you get up to a certain boost. A slit or leak that opens up under pressure. Next would be the tuning. I had tunes that would cause such bad surging and then tunes that had none. How the fuel is brought in seems to also make a difference. But if this is something that just recently started that did not happen under the same circumstances before I would be looking at a leak somewhere. Make a boost leak detector you can clamp tight and hook some pressurized air to it. [/QUOTE]
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