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Poping

Engine

Vehicle Information: Year: 1984; Engine (Size, Modifications): 3.3turbo, 650 intercooler, K129 turbo, 1.1 spring; Total Mileage: 55,000;

I have upgraded my turbo (k129), Kokeln intercooler (650) and wastegate spring (1.1). I have the stock Euro. exhaust with a Kokeln muffer. I now get a poping sound, when I let off the gas. The fusl flow has not been changed. What would you recommend for fuel flow and what, do you think, would cause this poping. Thanks

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